Use mujoco function instead.

python/mujoco/__init__.py

@@ -81,12 +81,4 @@ if _MUJOCO_GL not in _MUJOCO_GL_DISABLE:
       from mujoco.glfw import GLContext
 
 
-def _get_version() -> str:
-  with open(os.path.join(HEADERS_DIR, 'mujoco.h'), 'r') as f:
-    for line in f:
-      if line.startswith('#define mjVERSION_HEADER'):
-        version = line.split()[2]
-        break
-  return '.'.join([d for d in str(version)])
-
-__version__ = _get_version()
+__version__ = mj_versionString()