Bump mdformat-admon from 2.0.6 to 2.1.1

Bumps [mdformat-admon](https://github.com/kyleking/mdformat-admon) from 2.0.6 to 2.1.1.
- [Release notes](https://github.com/kyleking/mdformat-admon/releases)
- [Commits](KyleKing/mdformat-admon@v2.0.6...v2.1.1)

---
updated-dependencies:
- dependency-name: mdformat-admon
  dependency-version: 2.1.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements/mdformat.txt

@@ -1,6 +1,6 @@
 # https://mdformat.readthedocs.io/en/stable/users/plugins.html
 mdformat == 0.7.22
-mdformat_admon == 2.0.6
+mdformat_admon == 2.1.1
 mdformat-config == 0.2.1
 mdformat_deflist == 0.1.3
 # XXX mdformat-footnote is stripping trailing comments in footnotes. See: