Update pyupgrade requirement from ~=2.37 to ~=2.38

Updates the requirements on [pyupgrade](https://github.com/asottile/pyupgrade) to permit the latest version.
- [Release notes](https://github.com/asottile/pyupgrade/releases)
- [Commits](asottile/pyupgrade@v2.37.0...v2.38.0)

---
updated-dependencies:
- dependency-name: pyupgrade
  dependency-type: direct:development
...

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

requirements-dev.txt

@@ -3,5 +3,5 @@ black==22.6.0
 packaging==21.3
 pre-commit~=2.20
 PyGithub~=1.55
-pyupgrade~=2.37
+pyupgrade~=2.38
 yamllint~=1.27