Add community.docker as a requirement for molecule testing

We explicitly add the `community.docker` collection with a minimum
version as a requirement to the molecule configuration. This will allow
us to ensure that a version of this collection that is compatible with
2.32.0 and newer of the Python requests library is installed.

molecule/default/requirements.yml

@@ -1,3 +1,8 @@
 ---
-- name: upgrade
-  src: https://github.com/cisagov/ansible-role-upgrade
+collections:
+  - name: community.docker
+    version: ">=3.10.2"
+
+roles:
+  - name: upgrade
+    src: https://github.com/cisagov/ansible-role-upgrade