Merge branch 'main' into zarr-python-use-sentinel-type

Author: d-v-b

.github/workflows/downstream.yml

@@ -37,6 +37,13 @@ jobs:
         uses: prefix-dev/setup-pixi@5185adfbffb4bd703da3010310260805d89ebb11 # v0.9.6
         with:
           manifest-path: xarray/pixi.toml
+          # Only install the environment our steps use. Installing every
+          # environment in xarray's manifest (the default) drags in
+          # `mypy-upstream`, which builds numcodecs from git and fails under
+          # newer pixi with `meson-python: error: Unknown option
+          # "pixi-conda-environment"` — unrelated to the zarr-python branch
+          # under test.
+          environments: test-py313
 
       - name: Install zarr-python from branch
         working-directory: xarray