Bump wheel from 0.35.1 to 0.38.1 in /docs

Bumps [wheel](https://github.com/pypa/wheel) from 0.35.1 to 0.38.1.
- [Release notes](https://github.com/pypa/wheel/releases)
- [Changelog](https://github.com/pypa/wheel/blob/main/docs/news.rst)
- [Commits](https://github.com/pypa/wheel/compare/0.35.1...0.38.1)

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

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

docs/requirements_docs.txt

@@ -1,6 +1,6 @@
 pip==21.1
 bump2version==1.0.0
-wheel==0.35.1
+wheel==0.38.1
 argh
 toml
 watchdog==0.10.3