Bump ajv from 6.12.6 to 8.12.0

Bumps [ajv](https://github.com/ajv-validator/ajv) from 6.12.6 to 8.12.0.
- [Release notes](https://github.com/ajv-validator/ajv/releases)
- [Commits](ajv-validator/ajv@v6.12.6...v8.12.0)

---
updated-dependencies:
- dependency-name: ajv
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

package.json

@@ -52,7 +52,7 @@
     "@angular/router": "^9.1.13",
     "@github/markdown-toolbar-element": "^2.1.1",
     "@octokit/rest": "^16.37.0",
-    "ajv": "^6.11.0",
+    "ajv": "^8.12.0",
     "apollo-angular": "^1.9.1",
     "apollo-angular-link-http": "^1.10.0",
     "apollo-cache-inmemory": "^1.6.0",