'echo Admin:changeme | chpasswd' for CUPS w/ ansible-core 2.17+

[holta]

Fixes bug:

• Test ansible-core 2.17 ETA 2024-05-20 [CUPS error due to Python crypt module deprecation] #3727 (comment)

Description of changes proposed in this pull request:

Ansible's password-setting routine with its user module being broken for now, we use standard Linux command chpasswd instead!

Smoke-tested on which OS or OS's:

Ubuntu Server 24.04

Mention a team member @username e.g. to help with code review:

Thanks to @jvonau for reminding us (on #3727) that we'd been warned about this a year ago:

• CUPS warning on Ubuntu 23.10: "Python crypt module is deprecated and will be removed from Python 3.13. Install the passlib library for continued encryption functionality" #3571