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 collection requirements to restore EL7 compatibility while leaving other collection references unchanged.

File-Level Changes

Change	Details	Files
Pin ansible.posix collection to a specific version compatible with EL7.	Update collection requirements to specify ansible.posix version 2.1.0 instead of using the latest by default Keep fedora.linux_system_roles collection requirement unchanged	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 (EL7 compatibility) to avoid accidental upgrades in future refactors.
• If this collection is used across multiple platforms, consider whether a more flexible version constraint (e.g., <=2.1.0 or environment-specific requirements) would better handle non-EL7 hosts while still protecting EL7.

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 (EL7 compatibility) to avoid accidental upgrades in future refactors.
- If this collection is used across multiple platforms, consider whether a more flexible version constraint (e.g., `<=2.1.0` or environment-specific requirements) would better handle non-EL7 hosts while still protecting EL7.

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📥 Commits

Reviewing files that changed from the base of the PR and between e824b9b and 505cd31.

📒 Files selected for processing (1)

• meta/collection-requirements.yml

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