CI: Try ruby 3.4.5

Author: bastelfreak

.github/workflows/tests.yaml

@@ -180,7 +180,8 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-24.04, windows-2025]
-        ruby: ${{ fromJSON(needs.rubocop_and_matrix.outputs.ruby) }}
+        #ruby: ${{ fromJSON(needs.rubocop_and_matrix.outputs.ruby) }}
+      ruby: ['3.4.5']
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout repository