Declare a runtime dependency on setuptools (for pkg_resources)
    
    Other packages fail to build with:
    
        Traceback (most recent call last):
          File "/usr/lib/python3.11/site-packages/sphinx/config.py", line 350, in eval_config_file
            exec(code, namespace)
          File "/builddir/build/BUILD/pgadmin4-6.20/docs/en_US/conf.py", line 25, in <module>
            import config
          File "/builddir/build/BUILD/pgadmin4-6.20/docs/en_US/../../web/config.py", line 25, in <module>
            from pgadmin.utils import env, IS_WIN, fs_short_path
          File "/builddir/build/BUILD/pgadmin4-6.20/web/pgadmin/__init__.py", line 32, in <module>
            from flask_security import Security, SQLAlchemyUserDatastore, current_user
          File "/usr/lib/python3.11/site-packages/flask_security/__init__.py", line 14, in <module>
            from .changeable import admin_change_password
          File "/usr/lib/python3.11/site-packages/flask_security/changeable.py", line 19, in <module>
            from .utils import config_value, hash_password, login_user, send_mail
          File "/usr/lib/python3.11/site-packages/flask_security/utils.py", line 17, in <module>
            from pkg_resources import parse_version
        ModuleNotFoundError: No module named 'pkg_resources'