Merge pull request #3917 from Unidata/dependabot-pip-ci-dask-2025.9.0

CI: (deps): Bump dask from 2025.7.0 to 2025.9.0 in /ci

Author: unidata-pr-helper[bot]

ci/extra_requirements.txt

@@ -1,5 +1,5 @@
 cartopy==0.24.0
-dask==2025.7.0
+dask==2025.9.0
 netCDF4==1.7.2
 shapely==2.1.1
 boto3==1.40.1