Bump python-pptx from 0.6.23 to 1.0.2 in /docker/py3-native (#31073)

Bumps [python-pptx](https://github.com/scanny/python-pptx) from 0.6.23 to 1.0.2.
- [Changelog](https://github.com/scanny/python-pptx/blob/master/HISTORY.rst)
- [Commits](scanny/python-pptx@v0.6.23...v1.0.2)

---
updated-dependencies:
- dependency-name: python-pptx
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>