Update myst-parser[linkify] requirement in /requirements

Updates the requirements on [myst-parser[linkify]](https://github.com/executablebooks/MyST-Parser) to permit the latest version.
- [Release notes](https://github.com/executablebooks/MyST-Parser/releases)
- [Changelog](https://github.com/executablebooks/MyST-Parser/blob/master/CHANGELOG.md)
- [Commits](executablebooks/MyST-Parser@v0.13.0...v3.0.1)

---
updated-dependencies:
- dependency-name: myst-parser[linkify]
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements/documentation.txt

@@ -2,7 +2,7 @@
 # -----------------------
 
 furo==2024.*
-myst-parser[linkify]>=0.13,<2.1
+myst-parser[linkify]>=0.13,<3.1
 sphinx>=3.1,<8
 sphinx-autobuild==2024.2.4
 sphinx-copybutton>=0.2,<1