chore: add test execution for k8s 1.34 (kyma-project#2911)

Co-authored-by: Mostafa Shorim <mostafa.shorim@sap.com>

Author: a-thaler

.github/workflows/gardener-integration.yml

@@ -57,7 +57,7 @@ jobs:
     strategy:
       fail-fast: false # if one version is not working, continue tests on other versions
       matrix:
-        k8s_version: [1.33]
+        k8s_version: [1.33,1.34]
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code