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 to maintain compatibility with EL7 by updating the Ansible collection requirements metadata.

File-Level Changes

Change	Details	Files
Pin ansible.posix collection to version 2.1.0 for EL7 compatibility.	Add an explicit version constraint (2.1.0) to the ansible.posix collection entry in the Ansible collection requirements metadata to avoid using the incompatible 2.2.0 release.	meta/collection-requirements.yml

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[sourcery-ai]

Hey - I've left some high level feedback:

• Consider adding a brief inline comment in collection-requirements.yml explaining why ansible.posix is pinned to 2.1.0 (e.g., EL7 incompatibility with 2.2.0) so future upgrades don’t inadvertently reintroduce the issue.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider adding a brief inline comment in `collection-requirements.yml` explaining why `ansible.posix` is pinned to 2.1.0 (e.g., EL7 incompatibility with 2.2.0) so future upgrades don’t inadvertently reintroduce the issue.

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📥 Commits

Reviewing files that changed from the base of the PR and between 930a830 and 74ada14.

📒 Files selected for processing (1)

• meta/collection-requirements.yml

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