chore(deps): bump mdformat-admon in /tools/sgmdformat

Bumps [mdformat-admon](https://github.com/kyleking/mdformat-admon) from 2.0.3 to 2.0.6.
- [Release notes](https://github.com/kyleking/mdformat-admon/releases)
- [Commits](KyleKing/mdformat-admon@v2.0.3...v2.0.6)

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

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

tools/sgmdformat/requirements.txt

@@ -1,3 +1,3 @@
 mdformat-gfm==0.3.6
-mdformat-admon==2.0.3
+mdformat-admon==2.0.6
 mdformat-frontmatter==2.0.8