Add missing relativePath to parent

[jonesbusy]

Ensure it get resolved from remote repository

Testing done

CI only

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• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
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• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue

[jglick]

@jonesbusy BTW the extra space is only necessary for plugins still using maven-release-plugin, since it has a buggy XML round-trip parser/generator that would forcibly reinsert it on every release. For plugins using CD,

Suggested change

	<relativePath />
	<relativePath/>

suffices. (XML never needed a space here; sometimes XHTML documents used it, to work around very old buggy web browsers which did not actually include XML parsers and tried to parse as HTML.)