build(deps): bump ruby/setup-ruby from 1.305.0 to 1.306.0

Bumps [ruby/setup-ruby](https://github.com/ruby/setup-ruby) from 1.305.0 to 1.306.0.
- [Release notes](https://github.com/ruby/setup-ruby/releases)
- [Changelog](https://github.com/ruby/setup-ruby/blob/master/release.rb)
- [Commits](ruby/setup-ruby@0cb964f...c4e5b13)

---
updated-dependencies:
- dependency-name: ruby/setup-ruby
  dependency-version: 1.306.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/docs.yml

@@ -41,7 +41,7 @@ jobs:
     - name: Git Checkout
       uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
     - name: Set up Ruby
-      uses: ruby/setup-ruby@0cb964fd540e0a24c900370abf38a33466142735
+      uses: ruby/setup-ruby@c4e5b1316158f92e3d49443a9d58b31d25ac0f8f
       with:
         ruby-version: 3.4.5
         bundler-cache: true

.github/workflows/postrelease.yml

@@ -41,7 +41,7 @@ jobs:
       with:
         ref: next
     - name: Set up Ruby
-      uses: ruby/setup-ruby@0cb964fd540e0a24c900370abf38a33466142735
+      uses: ruby/setup-ruby@c4e5b1316158f92e3d49443a9d58b31d25ac0f8f
       with:
         ruby-version: 3.4.5
         bundler-cache: true