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 while leaving other collection requirements unchanged.

File-Level Changes

Change	Details	Files
Pin ansible.posix collection to a specific version compatible with EL7.	Add an explicit version constraint (2.1.0) to the ansible.posix collection requirement Keep existing collection requirements (fedora.linux_system_roles and community.general) unchanged, including the version range for community.general	meta/collection-requirements.yml

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[sourcery-ai]

Hey - I've left some high level feedback:

• Consider specifying a version range (e.g., ">=2.1.0,<2.2.0") instead of a single fixed version so that bugfix releases compatible with EL7 can be consumed without further changes.
• Add a brief code comment near the ansible.posix version pin explaining the EL7 compatibility issue, so future maintainers understand why the version is constrained.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider specifying a version range (e.g., ">=2.1.0,<2.2.0") instead of a single fixed version so that bugfix releases compatible with EL7 can be consumed without further changes.
- Add a brief code comment near the ansible.posix version pin explaining the EL7 compatibility issue, so future maintainers understand why the version is constrained.

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📥 Commits

Reviewing files that changed from the base of the PR and between b36751a and e2ad20b.

📒 Files selected for processing (1)

• meta/collection-requirements.yml

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