Deps: Bump pontos from 25.8.1 to 26.2.0 in the python-packages group

Bumps the python-packages group with 1 update: [pontos](https://github.com/greenbone/pontos).


Updates `pontos` from 25.8.1 to 26.2.0
- [Release notes](https://github.com/greenbone/pontos/releases)
- [Commits](greenbone/pontos@v25.8.1...v26.2.0)

---
updated-dependencies:
- dependency-name: pontos
  dependency-version: 26.2.0
  dependency-type: direct:development
  update-type: version-update:semver-major
  dependency-group: python-packages
...

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Author: dependabot[bot]