Upgrade pymunk to 6.4.0 (#1407)

Author: einarf

setup.py

@@ -81,7 +81,7 @@ def get_long_description() -> str:
     install_requires=[
         "pyglet==2.0.0",
         "pillow~=9.3.0",
-        "pymunk~=6.3.0",
+        "pymunk~=6.4.0",
         "pytiled-parser~=2.2.0",
     ],
     extras_require={