Bump pyupgrade from 2.27.0 to 2.28.0

Bumps [pyupgrade](https://github.com/asottile/pyupgrade) from 2.27.0 to 2.28.0.
- [Release notes](https://github.com/asottile/pyupgrade/releases)
- [Commits](asottile/pyupgrade@v2.27.0...v2.28.0)

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

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

pyproject.toml

@@ -44,7 +44,7 @@ pytest = "^6.2.4"
 pytest-asyncio = "^0.15.1"
 pytest-cov = "^2.12.1"
 yamllint = "^1.26.3"
-pyupgrade = "^2.27.0"
+pyupgrade = "^2.28.0"
 flake8-simplify = "^0.14.2"
 vulture = "^2.3"
 flake8-bandit = "^2.1.2"