Bump ruby/setup-ruby from 1.286.0 to 1.287.0

Bumps [ruby/setup-ruby](https://github.com/ruby/setup-ruby) from 1.286.0 to 1.287.0.
- [Release notes](https://github.com/ruby/setup-ruby/releases)
- [Changelog](https://github.com/ruby/setup-ruby/blob/master/release.rb)
- [Commits](ruby/setup-ruby@90be115...8d27f39)

---
updated-dependencies:
- dependency-name: ruby/setup-ruby
  dependency-version: 1.287.0
  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

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
-    - uses: ruby/setup-ruby@90be1154f987f4dc0fe0dd0feedac9e473aa4ba8 # v1.286.0
+    - uses: ruby/setup-ruby@8d27f39a5e7ad39aebbcbd1324f7af020229645c # v1.287.0
       with:
         bundler-cache: true
     - run: GOVUK_DOCKER_DIR=. make test-ci