Bump dask from 2025.9.0 to 2025.9.1

Bumps [dask](https://github.com/dask/dask) from 2025.9.0 to 2025.9.1.
- [Release notes](https://github.com/dask/dask/releases)
- [Changelog](https://github.com/dask/dask/blob/main/docs/release-procedure.md)
- [Commits](dask/dask@2025.9.0...2025.9.1)

---
updated-dependencies:
- dependency-name: dask
  dependency-version: 2025.9.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements.txt

@@ -60,7 +60,7 @@ coverage==7.10.6
     #   pytest-cov
 cycler==0.12.1
     # via matplotlib
-dask==2025.9.0
+dask==2025.9.1
     # via
     #   qcodes (pyproject.toml)
     #   qcodes