Bump ruby/setup-ruby from 1.205.0 to 1.206.0

Bumps [ruby/setup-ruby](https://github.com/ruby/setup-ruby) from 1.205.0 to 1.206.0.
- [Release notes](https://github.com/ruby/setup-ruby/releases)
- [Changelog](https://github.com/ruby/setup-ruby/blob/master/release.rb)
- [Commits](ruby/setup-ruby@540484a...bfefad8)

---
updated-dependencies:
- dependency-name: ruby/setup-ruby
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/rubocop.yml

@@ -10,7 +10,7 @@ jobs:
       fail-fast: false
     steps:
       - uses: actions/checkout@v4
-      - uses: ruby/setup-ruby@540484a3c0f308b08619664ec40bf6c371d172c3
+      - uses: ruby/setup-ruby@bfefad842bb982ff05b233bcbc1571d97a87e69f
         with:
           ruby-version: 2.6
       - name: Install Code Scanning integration