refactor: use ansible.posix 2.1.X for EL7 compatibility [citest_skip]

[richm]

The recently released ansible.posix 2.2.0 does not work on EL7.
Pin the version of ansible.posix to 2.1.X.

NOTE: Even though this role might not support EL7, this update
is applied to all system roles for consistency. Plus, when this
role is part of the system roles collection, all roles must use
the same version of ansible.posix - there is no way for a role
which is part of a collection to use a different version of a
dependency than the version used by the other roles.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Pins the ansible.posix collection dependency to version 2.1.0 in order to maintain compatibility with EL7 environments.

File-Level Changes

Change	Details	Files
Pin ansible.posix collection to a specific compatible version for EL7.	Update the collection requirements to include an explicit version constraint for ansible.posix Ensure downstream installs pull ansible.posix 2.1.0 instead of the latest incompatible release	meta/collection-requirements.yml

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[sourcery-ai]

Hey - I've left some high level feedback:

• Consider adding a brief comment in meta/collection-requirements.yml explaining why ansible.posix is pinned to 2.1.0 (EL7 compatibility) so future maintainers know when it is safe to relax or update this constraint.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider adding a brief comment in `meta/collection-requirements.yml` explaining why `ansible.posix` is pinned to 2.1.0 (EL7 compatibility) so future maintainers know when it is safe to relax or update this constraint.

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📥 Commits

Reviewing files that changed from the base of the PR and between 96ae8b8 and 54b4429.

📒 Files selected for processing (1)

• meta/collection-requirements.yml

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