Bump pyupgrade from 3.19.1 to 3.20.0

Bumps [pyupgrade](https://github.com/asottile/pyupgrade) from 3.19.1 to 3.20.0.
- [Commits](asottile/pyupgrade@v3.19.1...v3.20.0)

---
updated-dependencies:
- dependency-name: pyupgrade
  dependency-version: 3.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements/pyupgrade.txt

@@ -1 +1 @@
-pyupgrade==3.19.1
+pyupgrade==3.20.0