Update CloudAgentRequirements to remove outdated OS

[brandonwest-netwrix]

Removed Windows Server 2012 R2 from the requirements list.

[github-actions]

Vale Linting

Vale found 1 issue(s) across the changed files.

docs/1secure/requirements/CloudAgentRequirements.md

Line	Rule	Message
37	Netwrix.OxfordComma	'Evaluation, PoC or' appears to be missing an Oxford comma. Add a comma before 'and' or 'or' in series of three or more items.

---

Fix these issues locally with vale <file> and push again, or comment @claude followed by your instructions (e.g., @claude fix only the Vale issues).

Automated fixes are only available for branches in this repository, not forks.