Bump CI os and Python versions

The integration tests use Python 3.8 / ubuntu 20.04. The problem is
that k8s-snap tests use type specifiers that require Python 3.10.

For this reason, we'll switch to Python 3.10 / ubuntu 22.04.

.github/workflows/k8s-snap-integration.yaml

@@ -15,15 +15,15 @@ concurrency:
 jobs:
   build:
     name: K8s-snap Integration Test
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     steps:
       - name: Checking out repo
         uses: actions/checkout@v4
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: "3.8"
+          python-version: "3.10"
       - name: Install tox
         run: pip install tox
       - name: Install Go