Update GitHub Actions workflow to use Ubuntu 22.04

Author: kavith-k

.github/workflows/tests.yml

@@ -9,7 +9,7 @@ permissions:
 
 jobs:
   tests:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
     - name: Checkout
       uses: actions/checkout@v3