Bump ruby/setup-ruby from 1.279.0 to 1.281.0

Bumps [ruby/setup-ruby](https://github.com/ruby/setup-ruby) from 1.279.0 to 1.281.0.
- [Release notes](https://github.com/ruby/setup-ruby/releases)
- [Changelog](https://github.com/ruby/setup-ruby/blob/master/release.rb)
- [Commits](ruby/setup-ruby@b90be12...675dd7b)

---
updated-dependencies:
- dependency-name: ruby/setup-ruby
  dependency-version: 1.281.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/push_gem.yml

@@ -30,7 +30,7 @@ jobs:
       - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
 
       - name: Set up Ruby
-        uses: ruby/setup-ruby@b90be12699fdfcbee4440c2bba85f6f460446bb0 # v1.279.0
+        uses: ruby/setup-ruby@675dd7ba1b06c8786a1480d89c384f5620a42647 # v1.281.0
         with:
           bundler-cache: true
           ruby-version: ruby

.github/workflows/test.yml

@@ -25,7 +25,7 @@ jobs:
     steps:
     - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
     - name: Set up Ruby
-      uses: ruby/setup-ruby@b90be12699fdfcbee4440c2bba85f6f460446bb0 # v1.279.0
+      uses: ruby/setup-ruby@675dd7ba1b06c8786a1480d89c384f5620a42647 # v1.281.0
       with:
         ruby-version: ${{ matrix.ruby }}
     - run: bundle install --jobs 4 --retry 3