gha: bump setup-ruby to latest (supports ruby4)

Author: ctrochalakis

.github/workflows/build.yml

@@ -41,7 +41,7 @@ jobs:
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
 
-      - uses: ruby/setup-ruby@44511735964dcb71245e7e55f72539531f7bc0eb # v1
+      - uses: ruby/setup-ruby@8aeb6ff8030dd539317f8e1769a044873b56ea71 # v1
         env:
           RSPEC_CORE: ${{ matrix.rspec-core-version }}
         with: