Pin numpy<2.0.0 (#178)

* Add new Python versions to testing matrix

* Pin numpy in environment-ci.yml

There are still a few incompatibilities with numpy 2.0.0, so we'll pin
the previous version for the moment. In particular, xESMF regridders
can't handle large grids with a number of points that overflows a
32-bit integer.

* Pin numpy<2.0.0 in pyproject.toml

* Remove Python 3.11 from testing

For some reason it seems to hang indefinitely. We'll just disable it
for the moment (3.12 works, anyway).

.github/workflows/testing.yml

@@ -23,7 +23,7 @@ jobs:
         shell: bash -el {0}
     strategy:
       matrix:
-        python-version: ["3.9", "3.10"]
+        python-version: ["3.9", "3.10", "3.12"]
 
     steps:
       - uses: actions/checkout@v3

environment-ci.yml

@@ -3,3 +3,4 @@ channels:
   - conda-forge
 dependencies:
   - esmpy
+  - numpy<2.0.0

pyproject.toml

@@ -12,7 +12,7 @@ dependencies = [
   "dask[array]",
   "dask[distributed]",
   "netCDF4",
-  "numpy >= 1.17.0",
+  "numpy >= 1.17.0, < 2.0.0",
   "scipy >= 1.2.0",
   "xarray",
   "xesmf >= 0.8.4",