Pin delocate to 0.11.0

Ideally we'd upgrade to delocate 0.12.0 and use the new delocate-merge command, but
it fails on numpy (matthew-brett/delocate#227), so we'll stick to
0.11.0 for now.

.github/workflows/build-multi-os.yml

@@ -313,7 +313,7 @@ jobs:
         run: |
           brew install avrdude
           mkdir tmp-wheel/
-          python -m pip install delocate
+          python -m pip install delocate==0.11.0
 
           # Find platform values on e.g. https://pypi.org/project/numpy/1.26.4/#files