CI: use ubuntu-22.04 and python3.10 in integration.yaml

This fixes the failing t-api integration CI tests with error:
'ERROR: Package 'teuthology-1.1.1.dev729-g861a8dcf' requires a different Python: 3.8.10 not in '>=3.10''

Signed-off-by: Vallari Agrawal <val.agl002@gmail.com>

Author: VallariAg

.github/workflows/integration.yaml

@@ -3,7 +3,13 @@ on: pull_request
 
 jobs:
   test:
-    runs-on: ubuntu-latest
+    name: Integration test on python${{ matrix.python }} via ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        include:
+          - os: ubuntu-22.04
+            python: "3.10"
     steps:
       - uses: actions/checkout@v2
       - name: Start teuthology & teuthology-api