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 to version 2.1.0 in collection requirements to avoid incompatibility with EL7 while keeping other collection constraints unchanged.

File-Level Changes

Change	Details	Files
Pin ansible.posix collection to a specific compatible version.	Add an explicit version constraint 2.1.0 for the ansible.posix collection in the Ansible collection requirements file while leaving existing community.general constraints as-is	meta/collection-requirements.yml

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[sourcery-ai]

Hey - I've left some high level feedback:

• Consider adding a brief inline comment near the pinned ansible.posix version explaining the EL7 compatibility issue so future changes to this pin are made with that context in mind.
• Instead of hard-pinning to 2.1.0, you might want to use a version range (e.g., '<2.2.0') if other 2.x releases remain EL7-compatible, to reduce future maintenance overhead when updating dependencies.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider adding a brief inline comment near the pinned ansible.posix version explaining the EL7 compatibility issue so future changes to this pin are made with that context in mind.
- Instead of hard-pinning to 2.1.0, you might want to use a version range (e.g., '<2.2.0') if other 2.x releases remain EL7-compatible, to reduce future maintenance overhead when updating dependencies.

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📥 Commits

Reviewing files that changed from the base of the PR and between 9772f53 and a454a46.

📒 Files selected for processing (1)

• meta/collection-requirements.yml

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