Bump azure-pipelines-test-container to v4.0.1 @ CI (#80938)

This patch updates the test container used in CI to the new v4 that
defaults to using Python 3.10 and is based on Ubuntu 22.04 Jammy[[1]].

[1]: https://github.com/ansible/azure-pipelines-test-container/pull/17

.azure-pipelines/azure-pipelines.yml

@@ -31,7 +31,7 @@ variables:
   - name: fetchDepth
     value: 500
   - name: defaultContainer
-    value: quay.io/ansible/azure-pipelines-test-container:3.0.0
+    value: quay.io/ansible/azure-pipelines-test-container:4.0.1
 
 pool: Standard