CI: ensure numpy is installed during type-checking

Author: jorenham

.github/workflows/type_check.yml

@@ -25,8 +25,7 @@ jobs:
         run: |
           uv venv .venv
           source .venv/bin/activate
-          uv pip install .
-          uv pip install mypy
+          uv pip install . numpy mypy
 
       - name: run mypy
         run: >