Bump idna from 3.4 to 3.7 in /llvm/utils/git

Bumps [idna](https://github.com/kjd/idna) from 3.4 to 3.7.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v3.4...v3.7)

---
updated-dependencies:
- dependency-name: idna
  dependency-type: direct:production
...

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

Author: dependabot[bot]

llvm/utils/git/requirements_formatting.txt

@@ -24,7 +24,7 @@ darker==1.7.2
     # via -r llvm/utils/git/requirements_formatting.txt.in
 deprecated==1.2.14
     # via pygithub
-idna==3.4
+idna==3.7
     # via requests
 mypy-extensions==1.0.0
     # via black