Remove pip from dependencies

pip itself shoudln't be required and might cause this error

setup.py

@@ -41,7 +41,6 @@
     long_description_content_type="text/markdown",
     license="Custom",
     install_requires=[
-        "pip>=21",
         'importlib-metadata<=4.12.0; python_version <= "3.7"',  # problem with gym for importlib-metadata==5.0.0 and python <=3.7
         "setuptools",
         "distro>=1",