Improve compatibility with dask-expr

[hoxbro]

Fixes https://github.com/holoviz/datashader/issues/1331

• [x] Needs to add a test
• [x] Add comment about the line

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 85.61%. Comparing base (7c1111c) to head (d9ba50a). Report is 5 commits behind head on main.

:exclamation: Current head d9ba50a differs from pull request most recent head 54f5453

Please upload reports for the commit 54f5453 to get more accurate results.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1335 +/- ## ========================================== + Coverage 85.58% 85.61% +0.03% ========================================== Files 51 50 -1 Lines 11290 11263 -27 ========================================== - Hits 9662 9643 -19 + Misses 1628 1620 -8 ```