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, replacing the implicit use of the latest 2.x release.

File-Level Changes

Change	Details	Files
Pin ansible.posix collection to a specific, EL7-compatible version.	Update the collection requirements to specify ansible.posix version 2.1.0 instead of using an unpinned latest version	meta/collection-requirements.yml

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Hey - I've reviewed your changes and they look great!

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📥 Commits

Reviewing files that changed from the base of the PR and between 7d17721 and e03ef68.

📒 Files selected for processing (1)

• meta/collection-requirements.yml

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