centos8-test:2025.02 no longer has a /usr/bin/python installed, so use
centos8-py3 target which sets `ansible_python_interpreter=/usr/bin/python3` in
the templated inventory.
Ansible <= 9 (ansible-core <= 2.6) now discover the interpreter as
/usr/bin/python3 on debian11-test:2025.02, as opposed to
/usr/bin/python3.9 on debian11-test:2021. I'm don't know the exact
cause. From manual tests the change in observed behaviour appears to be common to
vanilla Ansible (strategy=linear) and Mitogen flavour
(strategy=mitogen_linear).
```console
(ans9) ➜ mitogen git:(4efb7158) ✗ ANSIBLE_STRATEGY=mitogen_linear ANSIBLE_STRATEGY_PLUGINS=ansible_mitogen/plugins/strategy ans9/bin/ansible -e ansible_python_interpreter=auto -mping d11.lan
d11.lan | SUCCESS => {
"ansible_facts": {
"discovered_interpreter_python": "/usr/bin/python3"
},
"changed": false,
"ping": "pong"
}
(ans9) ➜ mitogen git:(4efb7158) ✗ ans9/bin/ansible -e ansible_python_interpreter=auto -mping d11.lan
d11.lan | SUCCESS => {
"ansible_facts": {
"discovered_interpreter_python": "/usr/bin/python3"
},
"changed": false,
"ping": "pong"
}
```
Update some tests which assume `/usr/bin/python` exists or that `env python`
will resolve successfully.
Alex Willmer