Remove Windows + Python3.9 due to Numpy bug

Author: AlexanderWells-diamond

.github/workflows/code.yml

@@ -71,6 +71,12 @@ jobs:
             cov_file: /output/coverage.xml
             results_file: /output/pytest-results.xml
 
+        exclude:
+          # Exclude Windows + Python 3.9 as p4p can't build there, due to numpy bug #27224
+          # which was never ported back to the 2.0.* numpy release stream.
+          - os: windows-latest
+            python: cp39
+
     name: build/${{ matrix.os }}/${{ matrix.python }}
     runs-on: ${{ matrix.os }}