chore(deps): bump black from 23.12.1 to 25.9.0 in /sdk/python

Bumps [black](https://github.com/psf/black) from 23.12.1 to 25.9.0.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](psf/black@23.12.1...25.9.0)

---
updated-dependencies:
- dependency-name: black
  dependency-version: 25.9.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

sdk/python/requirements/lint.txt

@@ -4,7 +4,7 @@
 #
 #    dagger dl -m dev deps --env=lint lock
 #
-black==23.12.1
+black==25.9.0
     # via -r requirements.in
 click==8.1.7
     # via black