Try to install dependencies and s3fs at the same time

s3fs depends on botocore but not boto3. Installing boto3 first
leads to incompatibilities when s3fs can lower the botocore
version.

.github/workflows/build.yaml

@@ -61,10 +61,10 @@ jobs:
 
       - name: Install dependencies
         shell: bash -l {0}
+        # Install s3fs with requirements.txt to allow self-consistent install.
         run: |
           pip install uv
-          uv pip install -r requirements.txt
-          uv pip install fsspec s3fs
+          uv pip install -r requirements.txt fsspec s3fs
 
       # We have two cores so we can speed up the testing with xdist
       - name: Install pytest packages