Fix build with Python 3.13 (#246)

* Fix build with Python 3.13, fixes #245
* Update build.yml to python 3.13

Author: FabioLolix

.github/workflows/build.yml

@@ -282,7 +282,7 @@ jobs:
 #           msvc-toolset: '14.16'
 
          - qt-arch: 'win64_msvc2019_64'
-           python-version: '3.12'
+           python-version: '3.13'
            python-arch: 'x64'
            qt-version: '5.15.*'
            pythonqtall-config: 'PythonQtCore PythonQtGui PythonQtMultimedia'

src/PythonQt.cpp

@@ -348,12 +348,6 @@ PythonQt::PythonQt(int flags, const QByteArray& pythonQtModuleName)
     Py_Initialize();
   }
 
-#ifdef PYTHONQT_FULL_THREAD_SUPPORT
-  if (!PyEval_ThreadsInitialized()) {
-    PyEval_InitThreads();
-  }
-#endif
-
   // add our own python object types for qt object slots
   if (PyType_Ready(&PythonQtSlotFunction_Type) < 0) {
     std::cerr << "could not initialize PythonQtSlotFunction_Type" << ", in " << __FILE__ << ":" << __LINE__ << std::endl;