Bump org.kohsuke:github-api from 1.318 to 1.321

Bumps [org.kohsuke:github-api](https://github.com/hub4j/github-api) from 1.318 to 1.321.
- [Release notes](https://github.com/hub4j/github-api/releases)
- [Changelog](https://github.com/hub4j/github-api/blob/main/CHANGELOG.md)
- [Commits](hub4j/github-api@github-api-1.318...github-api-1.321)

---
updated-dependencies:
- dependency-name: org.kohsuke:github-api
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

build.gradle

@@ -3,7 +3,7 @@ import org.kohsuke.github.GitHub
 
 buildscript {
     dependencies {
-        classpath 'org.kohsuke:github-api:1.318'
+        classpath 'org.kohsuke:github-api:1.321'
     }
 }