chore: upgrade ubuntu in matrix

Author: bshaffer

.github/workflows/tests.yml

@@ -10,7 +10,7 @@ jobs:
         runs-on: ${{ matrix.os }}
         strategy:
             matrix:
-                os: [ubuntu-20.04]
+                os: [ubuntu-24.04]
                 php: [ "8.0", "8.1", "8.2", "8.3", "8.4" ]
                 include:
                   - os: macos-latest