Bump ruby/setup-ruby from 1.274.0 to 1.278.0

Bumps [ruby/setup-ruby](https://github.com/ruby/setup-ruby) from 1.274.0 to 1.278.0.
- [Release notes](https://github.com/ruby/setup-ruby/releases)
- [Changelog](https://github.com/ruby/setup-ruby/blob/master/release.rb)
- [Commits](ruby/setup-ruby@ed55d55...4c24fa5)

---
updated-dependencies:
- dependency-name: ruby/setup-ruby
  dependency-version: 1.278.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -40,7 +40,7 @@ jobs:
     - name: Check out code
       uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
     - name: Set up Ruby ${{ matrix.ruby }}
-      uses: ruby/setup-ruby@ed55d55e820a01da7d3e4863a8c51a61d73c3228 # v1.274.0
+      uses: ruby/setup-ruby@4c24fa5ec04b2e79eb40571b1cee2a0d2b705771 # v1.278.0
       with:
         ruby-version: ${{ matrix.ruby }}
         bundler-cache: true