Ansible 2.20 support

##### SUMMARY
The README mentions supporting less than 2.19, but https://github.com/ansible-collections/cloud.common/pull/167 has been merged which appears to have added 2.19 support.
With 2.20 I am getting a warning that cloud.common is not supported. Any idea when it will be officially supported so the warning is not present?

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
cloud.common

##### ANSIBLE VERSION

```paste below
ansible [core 2.20.2]
config file = /runner/ansible.cfg
configured module search path = ['/root/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
ansible python module location = /usr/local/lib/python3.12/site-packages/ansible
ansible collection location = /root/.ansible/collections:/usr/share/ansible/collections:/runner/collections
executable location = /usr/local/bin/ansible
python version = 3.12.12 (main, Jan 16 2026, 00:00:00) [GCC 14.3.1 20250617 (Red Hat 14.3.1-2)] (/usr/bin/python3.12)
jinja version = 3.1.6
pyyaml version = 6.0.3 (with libyaml v0.2.5)
```

##### COLLECTION VERSION

```paste below
cloud.common 5.0.0
```

##### CONFIGURATION

```paste below
COLLECTIONS_PATHS(/runner/ansible.cfg) = ['/root/.ansible/collections', '/usr/share/ansible/collections', '/runner/collections']
CONFIG_FILE() = /runner/ansible.cfg
DEFAULT_FILTER_PLUGIN_PATH(/runner/ansible.cfg) = ['/runner/collections/ansible_collections/mts/common/plugins/filter']
DEFAULT_ROLES_PATH(/runner/ansible.cfg) = ['/runner/roles']
DEFAULT_STDOUT_CALLBACK(/runner/ansible.cfg) = community.general.timestamp
DEFAULT_TIMEOUT(/runner/ansible.cfg) = 40
HOST_KEY_CHECKING(/runner/ansible.cfg) = False
INTERPRETER_PYTHON(/runner/ansible.cfg) = auto_silent

```

##### OS / ENVIRONMENT

##### STEPS TO REPRODUCE

```yaml

```

##### EXPECTED RESULTS

##### ACTUAL RESULTS

```paste below

```

Review the README compatibility statement and the changes in merged pull request 167, then reproduce the warning with Ansible core 2.20.2 and cloud.common 5.0.0. Done means the collection officially supports Ansible 2.20 and the warning is no longer shown; the issue does not name a test or implementation file.

Written by the indexing model from the issue text.