Update fail-fast strategy and version matrix in GitHub workflow

The Github workflow configuration is updated with 'fail-fast: false' to prevent cancellation of all jobs if any matrix combo fails. The version matrix has also been simplified by removing versions 22 and 23 to streamline the testing process.

.github/workflows/main.yml

@@ -6,6 +6,7 @@ jobs:
     name: Run tests
     runs-on: [ self-hosted, small ]
     strategy:
+      fail-fast: false
       matrix:
         version:
           - 6
@@ -24,8 +25,6 @@ jobs:
           - 19
           - 20
           - 21
-          - 22
-          - 23
     steps:
       - uses: actions/checkout@v3