ci: bump ansible version

[PACordonnier]

Which issue(s) this PR fixes

Fixes CI. I get an error when installing collection on the CI (reproducible using dev/setup.sh)

Error being:

[WARNING]: Skipping Galaxy server https://galaxy.ansible.com. Got an unexpected error when getting available versions of collection community.general: Unknown error when attempting to call Galaxy at 'https://galaxy.ansible.com/api/': HTTPSConnection.__init__() got an unexpected keyword argument 'cert_file'.
HTTPSConnection.__init__() got an unexpected keyword argument 'cert_file'
ERROR! Unknown error when attempting to call Galaxy at 'https://galaxy.ansible.com/api/': HTTPSConnection.__init__() got an unexpected keyword argument 'cert_file'. HTTPSConnection.__init__() got an unexpected keyword argument 'cert_file'

Upgrading to latest ansible-core 2.15 fixes the issue

Additional comments

Agreements

• I hereby declare this contribution to be licensed under the Apache License Version 2.0, January 2004.
• I hereby agree to grant TOSIT a copyright license to use my contributions.

[PACordonnier]

TODO: fix to latest 2.15 instead of <2.16