Update vulture requirement from >=1.0 to >=2.16

Updates the requirements on [vulture](https://github.com/jendrikseipp/vulture) to permit the latest version.
- [Release notes](https://github.com/jendrikseipp/vulture/releases)
- [Changelog](https://github.com/jendrikseipp/vulture/blob/main/CHANGELOG.md)
- [Commits](jendrikseipp/vulture@v1.0...v2.16)

---
updated-dependencies:
- dependency-name: vulture
  dependency-version: '2.16'
  dependency-type: direct:development
...

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

Author: dependabot[bot]

dev-requirements.txt

@@ -1,5 +1,5 @@
 setuptools>=40.8.0
-vulture>=1.0
+vulture>=2.16
 bandit>=1.5.1
 pydocstyle>=3.0.0
 pytest>=4.3.1