build(deps): bump gatsby-plugin-offline from 5.6.0 to 5.11.1 in /docs (#2716)

Author: dependabot[bot]

Diff for: docs/package-lock.json

@@ -20,7 +20,7 @@
     "gatsby-plugin-mdx": "^3.9.0",
     "gatsby-plugin-netlify": "^4.1.0",
     "gatsby-plugin-netlify-cache": "^2.0.0",
-    "gatsby-plugin-offline": "^5.6.0",
+    "gatsby-plugin-offline": "^5.11.1",
     "gatsby-plugin-react-helmet": "^5.6.0",
     "gatsby-plugin-react-svg": "^3.1.0",
     "gatsby-plugin-robots-txt": "^1.7.0",