build(deps): Bump third_party/cmark from `3460cd8` to `fe86913`

[dependabot[bot]]

Bumps third_party/cmark from 3460cd8 to fe86913.

Commits

• fe86913 Fix python warnings about regexp escape sequences
• 1e30143 Update cmake_minimum_required to 3.14
• 21abe60 build(deps): bump actions/upload-artifact from 4 to 5
• 5a15425 Replace link to unmaintained Python bindings
• b8886b2 Update to Unicode 17.0
• 57926f0 Commonmark renderer: fix bug with empty item at end of list.
• 1099136 build(deps): bump actions/checkout from 4 to 5
• 6566bbd [cmake] Remove handling CMP0063
• See full diff in compare view

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