Add OpenKara 0.5.1

[thedavidweng]

Checklist for Pull Requests

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• Is there a linked Issue? If so, fill in the Issue number below.
  • Resolves #[Issue Number]

Manifests

• Have you checked that there aren't other open pull requests for the same manifest update/change?
• This PR only modifies one (1) manifest
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Microsoft Reviewers: Open in CodeFlow

[wingetbot]

Validation Pipeline Run WinGetSvc-Validation-138-359769-20260413-1

[stephengillie]

Automatic Validation ended with:

Executable C:\Users\validator\AppData\Local\OpenKara\openkara.exe returned exit code: 101
Executable C:\Users\validator\AppData\Local\OpenKara\local-audio-smoke.exe returned exit code: 1

Hex	Dec	Inverted Dec	Symbol	Description
00000001	1	-4294967295	ERROR_INVALID_FUNCTION	Incorrect function.
00000065	101	-4294967195	ERROR_EXCL_SEM_ALREADY_OWNED	The exclusive semaphore is owned by another process.

(Automated response - build 1247.)

[wingetbot]

Publish pipeline succeeded for this Pull Request. Once you refresh your index, this change should be present.