chore(deps-dev): bump myst-parser from 5.0.0 to 5.1.0 #254

Job	Run time
Dependency audit (uv audit)	12s
Workflow lint (actionlint)	32s
Changelog fragment gate (Towncrier)	5s
News fragment naming (ID + KAC type)	10s
Type Check	11s
Lint	11s
Tests (windows-latest)	57s
Prose lint (codespell + doc8 + interrogate)	23s
Briefcase smoke test (Linux)	57s
Tests (macos-latest)	41s
Tests (ubuntu-latest)	35s
Docs touch gate	3s
Docs (build + linkcheck)	51s
	5m 48s

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