Bump rubocop-github from 0.19.0 to 0.20.0

Bumps [rubocop-github](https://github.com/github/rubocop-github) from 0.19.0 to 0.20.0.
- [Release notes](https://github.com/github/rubocop-github/releases)
- [Changelog](https://github.com/github/rubocop-github/blob/main/CHANGELOG.md)
- [Commits](github/rubocop-github@v0.19.0...v0.20.0)

---
updated-dependencies:
- dependency-name: rubocop-github
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -83,10 +83,10 @@ GEM
       unicode-display_width (>= 2.4.0, < 3.0)
     rubocop-ast (1.29.0)
       parser (>= 3.2.1.0)
-    rubocop-github (0.19.0)
-      rubocop (>= 1.0.0)
-      rubocop-performance
-      rubocop-rails
+    rubocop-github (0.20.0)
+      rubocop (>= 1.37)
+      rubocop-performance (>= 1.15)
+      rubocop-rails (>= 2.17)
     rubocop-performance (1.19.1)
       rubocop (>= 1.7.0, < 2.0)
       rubocop-ast (>= 0.4.0)