A new upstream version of Pygments is now available: 2.17.2.
Wikimedia production wikis are currently using 2.16.1 via shellbox. The beta cluster is using 2.16.0 via the bundled version of Pygments in the extension. Upstream's change log for 2.16.1-2.17.2 includes updates for the wikitext lexer from @Diskdance:
Previously: T335460: New upstream release for Pygments (2.16.1)
Next: T364249: New upstream release for Pygments (2.18.0)