fix: guides/web-analytics/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-BRACES-6838727
- https://snyk.io/vuln/SNYK-JS-MICROMATCH-6838728

guides/web-analytics/package.json

@@ -4,7 +4,7 @@
   "version": "0.0.1",
   "author": "Statsbot, Inc.",
   "dependencies": {
-    "gatsby": "^2.15.28",
+    "gatsby": "^4.22.0",
     "gatsby-image": "^2.2.23",
     "gatsby-plugin-catch-links": "^2.1.12",
     "gatsby-plugin-google-analytics": "^2.1.19",
@@ -13,7 +13,7 @@
     "gatsby-plugin-nprogress": "^2.1.9",
     "gatsby-plugin-offline": "^3.0.11",
     "gatsby-plugin-react-helmet": "^3.1.10",
-    "gatsby-plugin-sharp": "^2.2.27",
+    "gatsby-plugin-sharp": "^3.13.0",
     "gatsby-plugin-sitemap": "^2.2.16",
     "gatsby-plugin-styled-components": "^3.1.9",
     "gatsby-plugin-twitter": "^2.1.9",