Update test container versions (#75447)

* Update test container versions to use the most recent which contain Python 3.10.0 RC1

changelogs/fragments/75447-update-test-containers.yaml

@@ -0,0 +1,3 @@
+minor_changes:
+  - Update test container default-test-container to version 3.7.0
+  - Update test container ansible-core-test-container to version 3.7.0

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

@@ -1,5 +1,5 @@
-default name=quay.io/ansible/default-test-container:3.6.0 python=3.9,2.6,2.7,3.5,3.6,3.7,3.8,3.10 seccomp=unconfined context=collection
-default name=quay.io/ansible/ansible-core-test-container:3.6.0 python=3.9,2.6,2.7,3.5,3.6,3.7,3.8,3.10 seccomp=unconfined context=ansible-core
+default name=quay.io/ansible/default-test-container:3.7.0 python=3.9,2.6,2.7,3.5,3.6,3.7,3.8,3.10 seccomp=unconfined context=collection
+default name=quay.io/ansible/ansible-core-test-container:3.7.0 python=3.9,2.6,2.7,3.5,3.6,3.7,3.8,3.10 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