Footnotes with "w" in the anchor don't render as footnotes!

What does this MR do and why?

This bug in cmark-gfm is now fixed, allowing footnote references to have a w in there name.

Updated commonmarker gem to 0.23.2

Screenshots or screen recordings

Taken from the issue, this markdown should now render correctly

Footnotes are only recognised sometimes.[^like-this]

The problem seems to be when there's a w in the footnote anchor.[^w]

Anchors without w seem to render OK. It's just those with w that get ignored.[^a] [^w2] [^a2] [^this-is-not-awesome] [^this-is-not-rad]

[^like-this]: Like this.
  
[^w]: This won't be rendered.
  
[^a]: This will be rendered.
  
[^w2]: This won't be rendered.
  
[^a2]: This will be rendered.
  
[^this-is-not-awesome]: This will not be rendered.
  
[^this-is-not-rad]: This will be rendered.

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Footnotes are only recognised sometimes.¹

The problem seems to be when there's a w in the footnote anchor.²

Anchors without w seem to render OK. It's just those with w that get ignored.^{3 4 5 6 7}

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How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

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Related to #24423 (closed)

1. Like this. ↩

2. This won't be rendered (but now if - Fixed!!). ↩

3. This will be rendered. ↩

4. This won't be rendered (but now if - Fixed!!). ↩

5. This will be rendered. ↩

6. This will not be rendered (but now if - Fixed!!). ↩

7. This will be rendered. ↩