infra: bump vulture from 2.11 to 2.12 in /dockerfile

Bumps [vulture](https://github.com/jendrikseipp/vulture) from 2.11 to 2.12.
- [Release notes](https://github.com/jendrikseipp/vulture/releases)
- [Changelog](https://github.com/jendrikseipp/vulture/blob/main/CHANGELOG.md)
- [Commits](jendrikseipp/vulture@v2.11...v2.12)

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

Signed-off-by: dependabot[bot] <[email protected]>

dockerfile/anaconda-ci/requirements.txt

@@ -22,4 +22,4 @@ astroid == 3.2.4
 ruff == 0.6.7
 
 # vulture for dead code analysis
-vulture == 2.11
+vulture == 2.12