CI: test with numpy v1 and v2 (#32)

.github/workflows/tests.yml

@@ -15,6 +15,7 @@ jobs:
       matrix:
         python-version: ["3.10", "3.11", "3.12"]
         os: [ubuntu-latest]
+        numpy_version: ["< 2", "> 2"]
 
     runs-on: ${{ matrix.os }}
 
@@ -46,6 +47,9 @@ jobs:
 
       - name: install deps
         run: |
+          # Super low tech, no need for tox just yet.
+          # Thanks: https://til.simonwillison.net/github-actions/running-tests-against-multiple-verisons-of-dependencies
+          pip install "numpy ${{ matrix.numpy_version }}"
           pip install -e ".[test,dask]"
 
       - name: lint