refactor: use ansible.posix 2.1.X for EL7 compatibility

[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 maintain EL7 compatibility.

File-Level Changes

Change	Details	Files
Pin ansible.posix collection to version 2.1.0 for compatibility with EL7.	Update the ansible.posix collection dependency to explicitly specify version 2.1.0 in collection requirements Keep existing fedora.linux_system_roles collection dependency 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 next to the pinned ansible.posix version explaining the EL7 compatibility reason so future maintainers understand why this specific version is required.
• If possible, use a version range (e.g., <=2.1.0) instead of a hard pin to 2.1.0 so you can pick up compatible patch releases automatically while still avoiding 2.2.0 on EL7.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider adding a brief inline comment next to the pinned `ansible.posix` version explaining the EL7 compatibility reason so future maintainers understand why this specific version is required.
- If possible, use a version range (e.g., `<=2.1.0`) instead of a hard pin to `2.1.0` so you can pick up compatible patch releases automatically while still avoiding 2.2.0 on EL7.

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📥 Commits

Reviewing files that changed from the base of the PR and between c7cc64a and b2717dd.

📒 Files selected for processing (1)

• meta/collection-requirements.yml

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