docs/Homebrew-Governance.md: fix broken link

[bevanjkay]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew typecheck with your changes locally?
• Have you successfully run brew tests with your changes locally?

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The anchor #Meek was removed from https://en.wikipedia.org/wiki/Counting_single_transferable_votes in a recent edit. I have updated the link to connect to the anchor that does still exist (note that the section on the Meek method was removed).

Other options;

• Link to an archived version of the page.
• Link to the article without an anchor.

Unblocks #19296

[p-linnane]

Makes sense, thanks!