Bump wheel from 0.26.0 to 0.38.1 in /doc

Bumps [wheel](https://github.com/pypa/wheel) from 0.26.0 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/0.26.0...0.38.1)

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

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

doc/requirements.txt

@@ -22,4 +22,4 @@ sphinx-autobuild==0.5.2
 sphinx-rtd-theme==0.1.9
 tornado==4.3
 watchdog==0.8.3
-wheel==0.26.0
+wheel==0.38.1