Bump pontos from 21.6.3 to 21.6.12

Bumps [pontos](https://github.com/greenbone/pontos) from 21.6.3 to 21.6.12.
- [Release notes](https://github.com/greenbone/pontos/releases)
- [Changelog](https://github.com/greenbone/pontos/blob/master/CHANGELOG.md)
- [Commits](greenbone/pontos@v21.6.3...v21.6.12)

---
updated-dependencies:
- dependency-name: pontos
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

pyproject.toml

@@ -55,7 +55,7 @@ pylint = "^2.8.3"
 rope = "^0.19.0"
 autohooks-plugin-pylint = "^21.6.0"
 autohooks-plugin-black = {version = "^1.2.0", python = "^3.7"}
-pontos = "^21.6.3"
+pontos = "^21.6.12"
 black = {version = "21.6b0", python = "^3.7"}
 
 [tool.poetry.scripts]