Bump vulture from 2.8 to 2.9.1

Bumps [vulture](https://github.com/jendrikseipp/vulture) from 2.8 to 2.9.1.
- [Release notes](https://github.com/jendrikseipp/vulture/releases)
- [Changelog](https://github.com/jendrikseipp/vulture/blob/main/CHANGELOG.md)
- [Commits](https://github.com/jendrikseipp/vulture/compare/v2.8...v2.9.1)

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

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

pyproject.toml

@@ -62,7 +62,7 @@ python-dotenv = "==1.0.0"
 radon = "==6.0.1"
 sqlalchemy = "==1.4.40"
 werkzeug = "~=2.3"
-vulture = "==2.8"
+vulture = "==2.9.1"
 packaging = "==23.1"
 notifications-utils = {git = "https://github.com/GSA/notifications-utils.git", develop = true, branch = "main"}
 newrelic = "*"