Use Python 3.12 in CI

Author: t-sommer

.github/workflows/build.yml

@@ -14,7 +14,7 @@ jobs:
     - uses: actions/checkout@v3
     - uses: actions/setup-python@v4
       with:
-        python-version: '3.10'
+        python-version: '3.12'
     - run: cmake . -G "Visual Studio 17 2022" -Bcpp_build
     - run: cmake --build cpp_build --config Release
     - run: cpp_build\Release\ExternalLibraryTest.exe