Update ansible-test default test container. (#74393)

* Update ansible-test default test container.
* Switch generic Python tests from 3.6 to 3.9.

.azure-pipelines/azure-pipelines.yml

@@ -157,7 +157,7 @@ stages:
           testFormat: generic/{0}/1
           targets:
             - test: 2.7
-            - test: 3.6
+            - test: 3.9
   - stage: Incidental_Remote
     displayName: Incidental Remote
     dependsOn: []

changelogs/fragments/ansible-test-default-container.yml

@@ -0,0 +1,2 @@
+minor_changes:
+  - ansible-test - The ``default`` test container has been updated to version 3.3.0 and now uses Python 3.9 by default instead of Python 3.6.

test/lib/ansible_test/_data/completion/docker.txt

@@ -1,5 +1,5 @@
-default name=quay.io/ansible/default-test-container:3.2.2 python=3.6,2.6,2.7,3.5,3.7,3.8,3.9 seccomp=unconfined context=collection
-default name=quay.io/ansible/ansible-core-test-container:3.2.0 python=3.6,2.6,2.7,3.5,3.7,3.8,3.9 seccomp=unconfined context=ansible-core
+default name=quay.io/ansible/default-test-container:3.3.0 python=3.9,2.6,2.7,3.5,3.6,3.7,3.8 seccomp=unconfined context=collection
+default name=quay.io/ansible/ansible-core-test-container:3.3.0 python=3.9,2.6,2.7,3.5,3.6,3.7,3.8 seccomp=unconfined context=ansible-core
 alpine3 name=quay.io/ansible/alpine3-test-container:2.0.2 python=3.8
 centos6 name=quay.io/ansible/centos6-test-container:2.0.2 python=2.6 seccomp=unconfined
 centos7 name=quay.io/ansible/centos7-test-container:2.0.2 python=2.7 seccomp=unconfined