chore(deps): bump mdformat-gfm from 0.3.6 to 0.3.7 in /tools/sgmdformat

Bumps [mdformat-gfm](https://github.com/hukkin/mdformat-gfm) from 0.3.6 to 0.3.7.
- [Commits](hukkin/mdformat-gfm@0.3.6...0.3.7)

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

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

tools/sgmdformat/requirements.txt

@@ -1,3 +1,3 @@
-mdformat-gfm==0.3.6
+mdformat-gfm==0.3.7
 mdformat-admon==2.0.6
 mdformat-frontmatter==2.0.8