grpc_python_deps.bzl: remove duplicate rules_python entry

bazel/grpc_python_deps.bzl

@@ -40,14 +40,6 @@ def grpc_python_deps():
             sha256 = "aa96a691d3a8177f3215b14b0edc9641787abaaa30363a080165d06ab65e1161",
         )
 
-    if "rules_python" not in native.existing_rules():
-        http_archive(
-            name = "rules_python",
-            url = "https://github.com/bazelbuild/rules_python/archive/9d68f24659e8ce8b736590ba1e4418af06ec2552.zip",
-            sha256 = "f7402f11691d657161f871e11968a984e5b48b023321935f5a55d7e56cf4758a",
-            strip_prefix = "rules_python-9d68f24659e8ce8b736590ba1e4418af06ec2552",
-        )
-
     python_configure(name = "local_config_python")
 
     native.bind(