build(deps): bump postcss and purgecss

Bumps [postcss](https://github.com/postcss/postcss) to 8.4.16 and updates ancestor dependency [purgecss](https://github.com/FullHuman/purgecss). These dependencies need to be updated together.


Updates `postcss` from 7.0.27 to 8.4.16
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/7.0.27...8.4.16)

Updates `purgecss` from 2.1.2 to 5.0.0
- [Release notes](https://github.com/FullHuman/purgecss/releases)
- [Changelog](https://github.com/FullHuman/purgecss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/FullHuman/purgecss/compare/v2.1.2...v5.0.0)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: indirect
- dependency-name: purgecss
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

package-lock.json

@@ -10071,31 +10071,14 @@
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     },
     "postcss": {
-      "version": "7.0.27",
+      "version": "8.4.16",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-7.0.27.tgz",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.16.tgz",
-      "integrity": "sha512-WuQETPMcW9Uf1/22HWUWP9lgsIC+KEHg2kozMflKjbeUtw9ujvFX6QmIfozaErDkmLWS9WEnEdEe6Uo9/BNTdQ==",
+      "integrity": "sha512-ipHE1XBvKzm5xI7hiHCZJCSugxvsdq2mPnsq5+UF+VHCjiBvtDrlxJfMBToWaP9D5XlgNmcFGqoHmUn0EYEaRQ==",
       "dev": true,
       "requires": {
-        "chalk": "^2.4.2",
+        "nanoid": "^3.3.4",
-        "source-map": "^0.6.1",
+        "picocolors": "^1.0.0",
-        "supports-color": "^6.1.0"
+        "source-map-js": "^1.0.2"
-      },
-      "dependencies": {
-        "source-map": {
-          "version": "0.6.1",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
-          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
-          "dev": true
-        },
-        "supports-color": {
-          "version": "6.1.0",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-6.1.0.tgz",
-          "integrity": "sha512-qe1jfm1Mg7Nq/NSh6XE24gPXROEVsWHxC1LIx//XNlD9iw7YZQGjZNjYN7xGaEG6iKdA8EtNFW6R0gjnVXp+wQ==",
-          "dev": true,
-          "requires": {
-            "has-flag": "^3.0.0"
-          }
-        }
       }
     },
     "postcss-calc": {
@@ -10604,22 +10587,63 @@
       }
     },
     "purgecss": {
-      "version": "2.1.2",
+      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/purgecss/-/purgecss-2.1.2.tgz",
+      "resolved": "https://registry.npmjs.org/purgecss/-/purgecss-5.0.0.tgz",
-      "integrity": "sha512-5oDBxiT9VonwKmEMohPFRFZrj8fdSVKxHPwq7G5Rx/2pXicZFJu+D4m5bb3NuV0sSK3ooNxq5jFIwwHzifP5FA==",
+      "integrity": "sha512-RAnuxrGuVyLLTr8uMbKaxDRGWMgK5CCYDfRyUNNcaz5P3kGgD2b7ymQGYEyo2ST7Tl/ScwFgf5l3slKMxHSbrw==",
       "dev": true,
       "requires": {
-        "commander": "^5.0.0",
+        "commander": "^9.0.0",
-        "glob": "^7.0.0",
+        "glob": "^8.0.3",
-        "postcss": "7.0.27",
+        "postcss": "^8.4.4",
-        "postcss-selector-parser": "^6.0.2"
+        "postcss-selector-parser": "^6.0.7"
       },
       "dependencies": {
+        "brace-expansion": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.0.1.tgz",
+          "integrity": "sha512-XnAIvQ8eM+kC6aULx6wuQiwVsnzsi9d3WxzV3FpWTGA19F621kwdbsAcFKXgKUHZWsy+mY6iL1sHTxWEFCytDA==",
+          "dev": true,
+          "requires": {
+            "balanced-match": "^1.0.0"
+          }
+        },
         "commander": {
-          "version": "5.1.0",
+          "version": "9.4.0",
-          "resolved": "https://registry.npmjs.org/commander/-/commander-5.1.0.tgz",
+          "resolved": "https://registry.npmjs.org/commander/-/commander-9.4.0.tgz",
-          "integrity": "sha512-P0CysNDQ7rtVw4QIQtm+MRxV66vKFSvlsQvGYXZWR3qFU0jlMKHZZZgw8e+8DSah4UDKMqnknRDQz+xuQXQ/Zg==",
+          "integrity": "sha512-sRPT+umqkz90UA8M1yqYfnHlZA7fF6nSphDtxeywPZ49ysjxDQybzk13CL+mXekDRG92skbcqCLVovuCusNmFw==",
           "dev": true
+        },
+        "glob": {
+          "version": "8.0.3",
+          "resolved": "https://registry.npmjs.org/glob/-/glob-8.0.3.tgz",
+          "integrity": "sha512-ull455NHSHI/Y1FqGaaYFaLGkNMMJbavMrEGFXG/PGrg6y7sutWHUHrz6gy6WEBH6akM1M414dWKCNs+IhKdiQ==",
+          "dev": true,
+          "requires": {
+            "fs.realpath": "^1.0.0",
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "^5.0.1",
+            "once": "^1.3.0"
+          }
+        },
+        "minimatch": {
+          "version": "5.1.0",
+          "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-5.1.0.tgz",
+          "integrity": "sha512-9TPBGGak4nHfGZsPBohm9AWg6NoT7QTCehS3BIJABslyZbzxfV78QM2Y6+i741OPZIafFAaiiEMh5OyIrJPgtg==",
+          "dev": true,
+          "requires": {
+            "brace-expansion": "^2.0.1"
+          }
+        },
+        "postcss-selector-parser": {
+          "version": "6.0.10",
+          "resolved": "https://registry.npmjs.org/postcss-selector-parser/-/postcss-selector-parser-6.0.10.tgz",
+          "integrity": "sha512-IQ7TZdoaqbT+LCpShg46jnZVlhWD2w6iQYAcYXfHARZ7X1t/UGhhceQDs5X0cGqKvYlHNOuv7Oa1xmb0oQuA3w==",
+          "dev": true,
+          "requires": {
+            "cssesc": "^3.0.0",
+            "util-deprecate": "^1.0.2"
+          }
         }
       }
     },

package.json

@@ -24,7 +24,7 @@
   },
   "devDependencies": {
     "prettier": "^1.19.1",
-    "purgecss": "^2.1.2"
+    "purgecss": "^5.0.0"
   },
   "repository": {
     "type": "git",