setup.cfg: remove setup_requires, fixes #7574

setup.cfg

@@ -36,8 +36,6 @@ packages = find_namespace:
 package_dir =
     =src
 python_requires = >=3.9
-setup_requires =
-   setuptools_scm[toml] >= 6.2
 install_requires =
   msgpack >=1.0.3, <=1.0.5
   packaging