Bump vermin from 1.5.2 to 1.6.0

Bumps [vermin](https://github.com/netromdk/vermin) from 1.5.2 to 1.6.0.
- [Release notes](https://github.com/netromdk/vermin/releases)
- [Commits](https://github.com/netromdk/vermin/compare/v1.5.2...v1.6.0)

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

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

pyproject.toml

@@ -62,7 +62,7 @@ dev = [
     "black==23.3.0",
     "flake8==5.0.4",
     "isort==5.11.5",
-    "vermin==1.5.2",
+    "vermin==1.6.0",
     "pytest>=6.2.5",
     "pytest-flask>=1.2.0",
     "pytest-libfaketime>=0.1.2",