Remove Ruby 3.1 on GitHub Actions and don't run ruby/specs on it

Author: andrykonchin

.github/workflows/ci.yml

@@ -242,7 +242,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ['3.1', '3.2', '3.3', '3.4']
+        ruby: ['3.2', '3.3', '3.4']
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4