build.yml: use python3.12

.github/workflows/build.yml

@@ -38,6 +38,9 @@ jobs:
   build_with_pyinstaller:
     needs: create_release
     runs-on: ubuntu-22.04
+    strategy:
+      matrix:
+        python-version: ["3.12"]
     name: create PyInstaller build
     permissions:
       contents: write