Bump @octokit/graphql-schema from 14.58.0 to 15.18.0

Bumps [@octokit/graphql-schema](https://github.com/octokit/graphql-schema) from 14.58.0 to 15.18.0.
- [Release notes](https://github.com/octokit/graphql-schema/releases)
- [Commits](octokit/graphql-schema@v14.58.0...v15.18.0)

---
updated-dependencies:
- dependency-name: "@octokit/graphql-schema"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

package.json

@@ -78,7 +78,7 @@
     "@graphql-codegen/typescript-document-nodes": "^4.0.7",
     "@graphql-codegen/typescript-operations": "^4.2.1",
     "@graphql-codegen/typescript-resolvers": "^4.1.0",
-    "@octokit/graphql-schema": "^14.58.0",
+    "@octokit/graphql-schema": "^15.18.0",
     "@octokit/types": "^13.5.0",
     "@types/jest": "^29.5.12",
     "@types/node": "^20.14.2",