Block Ansible 2.9.12

Ansible 2.9.12 changed default permissions of created files to 600 [1].
This breaks kayobe because kolla-ansible generates admin-openrc.sh owned
by root:root with mode 0600, which kayobe fails to read to generate
public-openrc.sh.

Block only Ansible 2.9.12 as the next release should include a revert of
this change.

[1] https://github.com/ansible/ansible/issues/71200

Depends-On: https://review.opendev.org/746220

Change-Id: I3de408d384141eee1a088d222dca7d583251a297
Story: 2008011
Task: 40661