Bump ruby/setup-ruby from 1.268.0 to 1.278.0

Bumps [ruby/setup-ruby](https://github.com/ruby/setup-ruby) from 1.268.0 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@8aeb6ff...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/exercise-tests.yml

@@ -22,7 +22,7 @@ jobs:
       - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3
 
       - name: Set up Ruby
-        uses: ruby/setup-ruby@8aeb6ff8030dd539317f8e1769a044873b56ea71
+        uses: ruby/setup-ruby@4c24fa5ec04b2e79eb40571b1cee2a0d2b705771
         with:
           ruby-version: ${{ matrix.ruby-version }}
           bundler-cache: true

.github/workflows/generator-tests.yml

@@ -14,7 +14,7 @@ jobs:
     steps:
       - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3
       - name: Set up Ruby
-        uses: ruby/setup-ruby@8aeb6ff8030dd539317f8e1769a044873b56ea71
+        uses: ruby/setup-ruby@4c24fa5ec04b2e79eb40571b1cee2a0d2b705771
         with:
           ruby-version: "3.3"
           bundler-cache: true
@@ -26,7 +26,7 @@ jobs:
     steps:
       - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3
       - name: Set up Ruby
-        uses: ruby/setup-ruby@8aeb6ff8030dd539317f8e1769a044873b56ea71
+        uses: ruby/setup-ruby@4c24fa5ec04b2e79eb40571b1cee2a0d2b705771
         with:
           ruby-version: "3.3"
           bundler-cache: true