Bump @octokit/graphql-schema from 14.34.0 to 15.25.0

Bumps [@octokit/graphql-schema](https://github.com/octokit/graphql-schema) from 14.34.0 to 15.25.0.
- [Release notes](https://github.com/octokit/graphql-schema/releases)
- [Commits](octokit/graphql-schema@v14.34.0...v15.25.0)

---
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>

Author: dependabot[bot]

package-lock.json

@@ -34,7 +34,7 @@
   },
   "devDependencies": {
     "@octokit/core": "^5.0.2",
-    "@octokit/graphql-schema": "^14.35.0",
+    "@octokit/graphql-schema": "^15.25.0",
     "@octokit/plugin-retry": "^5.0.5",
     "@octokit/plugin-throttling": "^8.1.3",
     "@octokit/types": "^12.4.0",