chore(ci): allow for optional colon when parsing PR description for issues

[mcansh]

GitHub docs don't mention that you can use a colon between a keyword and a PR/issue, but you totally can and our default PR template includes it

https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue#linking-a-pull-request-to-an-issue-using-a-keyword

Closes: #

• Docs
• Tests

Testing Strategy:

https://regexr.com/6pgpv

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