CI: Fix molecule job on Ubuntu Jammy

OpenDev has changed the image used for tox jobs to Ubuntu Jammy 22.04.
This broke molecule jobs, which started failing with:

ImportError: cannot import name 'Iterable' from 'collections'

This change updates requirements to bump molecule and pytest-metadata.
It also removes molecule flake8 lint configuration, which is no longer
supported.

Change-Id: I751a458f7668f7917abaa662723221ac7e3752c8

ansible/roles/kolla-openstack/molecule/default/molecule.yml

@@ -18,5 +18,3 @@ scenario:
   name: default
 verifier:
   name: testinfra
-  lint:
-    name: flake8

ansible/roles/kolla-openstack/molecule/enable-everything/molecule.yml

@@ -147,5 +147,3 @@ scenario:
   name: enable-everything
 verifier:
   name: testinfra
-  lint:
-    name: flake8

molecule-requirements.txt

@@ -4,9 +4,9 @@
 
 ansible-lint>=3.0.0,<6.0.0,!=4.3.0 # MIT
 docker # Apache-2.0
-molecule<3.5.0 # MIT
+molecule<4.1.0 # MIT
 molecule-docker # MIT
-pytest-metadata<2 # MPL
+pytest-metadata # MPL
 pytest-molecule # MIT
 pytest-testinfra
 yamllint # GPLv3