fix: client/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-ANSIHTML-1296849
- https://snyk.io/vuln/SNYK-JS-AXIOS-6032459
- https://snyk.io/vuln/SNYK-JS-MINIMATCH-3050818
- https://snyk.io/vuln/SNYK-JS-NODEFETCH-2342118
- https://snyk.io/vuln/SNYK-JS-OBJECTPATH-1569453
- https://snyk.io/vuln/SNYK-JS-OBJECTPATH-1585658
- https://snyk.io/vuln/SNYK-JS-SEMVER-3247795
- https://snyk.io/vuln/SNYK-JS-TRIM-1017038
- https://snyk.io/vuln/SNYK-JS-UNSETVALUE-2400660
- https://snyk.io/vuln/SNYK-JS-WS-1296835

client/package.json

@@ -66,8 +66,8 @@
     "enzyme": "3.11.0",
     "enzyme-adapter-react-16": "1.15.6",
     "final-form": "4.20.6",
-    "gatsby": "3.14.6",
-    "gatsby-cli": "3.14.2",
+    "gatsby": "5.0.0",
+    "gatsby-cli": "4.5.0",
     "gatsby-plugin-advanced-sitemap": "2.1.0",
     "gatsby-plugin-create-client-paths": "3.14.0",
     "gatsby-plugin-manifest": "3.14.0",