Fix crash when using directors in Python without limited API

Call correct functions when unlocking/destroying a mutex implemented
using Python API: they were accidentally exchanged in 21f1c92 (Make
directors implementation for Python work with limited API, 2019-12-23)
resulting in crashes when using directors and threads together.

Closes swig#2889, swig#3112.

CHANGES.current

@@ -7,6 +7,10 @@ the issue number to the end of the URL: https://github.com/swig/swig/issues/
 Version 4.4.0 (in progress)
 ===========================
 
+2025-01-27: StefanBattmer
+	    [Python] #2889 Fix regression when using directors and threads
+	    but not using limited API.
+
 2024-12-07: arbrauns
 	    [Lua] #3083 Fix "unsigned long long" being interpreted as "signed
 	    long long".

Lib/python/director_py_mutex.swg

@@ -16,9 +16,9 @@ namespace Swig {
        PyThread_type_lock mutex_;
    public:
        Mutex() : mutex_(PyThread_allocate_lock()) {}
-       ~Mutex() { PyThread_release_lock(mutex_); }
+       ~Mutex() { PyThread_free_lock(mutex_); }
        void lock() { PyThread_acquire_lock(mutex_, WAIT_LOCK); }
-       void unlock() { PyThread_free_lock(mutex_); }
+       void unlock() { PyThread_release_lock(mutex_); }
    };
 }
 #endif