Use k8s 1.23.3 in ci

Signed-off-by: Tamal Saha <tamal@appscode.com>

Author: tamalsaha

.github/workflows/ci.yml

@@ -46,7 +46,7 @@ jobs:
     needs: build
     strategy:
       matrix:
-        k8s: [v1.19.11, v1.20.7, v1.21.2, v1.22.4, v1.23.0]
+        k8s: [v1.19.11, v1.20.7, v1.21.2, v1.22.4, v1.23.3]
     steps:
       - uses: actions/checkout@v1