Add python 3.12 to build matrix

Author: timj

.github/workflows/build.yaml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]
-        pyversion: ["3.10", "3.11"]
+        pyversion: ["3.10", "3.11", "3.12"]
 
     runs-on: ${{ matrix.os }}
     steps: