Update xee dataflow example

This updates the xee dataflow example to prevent users from accidentally deleting storage bucket when running the example.

This is a really simple fix for a bug in a recent [push to gcsfs](fsspec/gcsfs#608) paired with some [logic in the zarr library for writing datasets](https:/zarr-developers/zarr-python/blob/df4c25f70c8a1e2b43214d7f26e80d34df502e7e/src/zarr/v2/storage.py#L567) which allows users to accidentally remove their bucket if writing to the root of a cloud storage bucket. This is problematic because users may have other data in a cloud storage bucket they may try to write to and accidental deletion of the bucket removes everything.

Changes in this PR include:
1. pinning the `gcsfs` version to `<=2024.2.0` before the PR that introduced the bug
2. point to write to subdirectory on the bucket in the example

PiperOrigin-RevId: 655683820

examples/dataflow/README.md

@@ -104,7 +104,7 @@ This example is focused on pulling data from Earth Engine, transforming the data
 ```shell
 python ee_to_zarr_dataflow.py \
  --input NASA/GPM_L3/IMERG_V06 \
- --output gs://xee-out-${PROJECT} \
+ --output gs://xee-out-${PROJECT}/output/ \
  --target_chunks='time=6' \
  --runner DataflowRunner \
  --project $PROJECT \

pyproject.toml

@@ -44,7 +44,7 @@ tests = [
 dataflow = [
  "absl-py",
  "apache-beam[gcp]",
- "gcsfs",
+ "gcsfs<=2024.2.0",
  "xarray-beam",
 ]
 examples = [