Bump idna from 3.4 to 3.7 in /docs/sphinx (#3007)

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](https://github.com/kjd/idna/compare/v3.4...v3.7)

---
updated-dependencies:
- dependency-name: idna
  dependency-type: indirect
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

docs/sphinx/requirements.txt

@@ -42,7 +42,7 @@ gitdb==4.0.10
     # via gitpython
 gitpython==3.1.41
     # via rocm-docs-core
-idna==3.4
+idna==3.7
     # via requests
 imagesize==1.4.1
     # via sphinx