fix: upgrade snyk from 1.337.0 to 1.339.3

Snyk has created this PR to upgrade snyk from 1.337.0 to 1.339.3.

See this package in NPM:
https://www.npmjs.com/package/snyk

See this project in Snyk:
https://app.snyk.io/org/creyd-github-marketplace/project/7687a902-5880-4dba-8e64-1ed2c0311711?utm_source=github&utm_medium=upgrade-pr

package.json

@@ -20,7 +20,7 @@
     "gatsby-plugin-manifest": "^2.4.11",
     "react": "^16.13.1",
     "react-dom": "^16.13.1",
-    "snyk": "^1.337.0"
+    "snyk": "^1.339.3"
   },
   "devDependencies": {
     "prettier": "^1.19.1",