Fix pypi-test-container port conflict.

changelogs/fragments/ansible-test-pypi-container-no-publish.yml

@@ -0,0 +1,3 @@
+bugfixes:
+  - ansible-test - Avoid publishing the port used by the ``pypi-test-container`` since it is only accessed by other containers.
+                   This avoids issues when trying to run tests in parallel on a single host.

test/lib/ansible_test/_internal/executor.py

@@ -1245,7 +1245,6 @@ def run_pypi_proxy(args):  # type: (EnvironmentConfig) -> t.Tuple[t.Optional[str
 
     options = [
         '--detach',
-        '-p', '%d:%d' % (port, port),
     ]
 
     docker_pull(args, proxy_image)