Bump ruby/setup-ruby from 1.276.0 to 1.278.0 (#253)

Bumps [ruby/setup-ruby](https://github.com/ruby/setup-ruby) from 1.276.0 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@ae195bb...4c24fa5)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/lint-markdown.yaml

@@ -37,7 +37,7 @@ jobs:
 
       - name: Set up Ruby
         # See https://github.com/ruby/setup-ruby#versioning
-        uses: ruby/setup-ruby@ae195bbe749a7cef685ac729197124a48305c1cb  # v1.276.0
+        uses: ruby/setup-ruby@4c24fa5ec04b2e79eb40571b1cee2a0d2b705771  # v1.278.0
         with:
           ruby-version: 3.0