Main build is very slow and times out

[tomwhite]

This started happening on August 17 for the 3.10 and 3.11 builds. Python 3.9 was unaffected.

Last successful build:
https://github.com/sgkit-dev/sgkit/actions/runs/10412794898/job/28839156503

First failing build:
https://github.com/sgkit-dev/sgkit/actions/runs/10428143416/job/28883923847

Here's a diff of the dependencies:

< aiohappyeyeballs-2.3.5
---
> aiohappyeyeballs-2.3.6
29,30c29,30
< dask-2024.8.0
< dask-expr-1.1.10
---
> dask-2024.8.1
> dask-expr-1.1.11
35c35
< distributed-2024.8.0
---
> distributed-2024.8.1

(Side note - what is aiohappyeyeballs?? 👀)