Upgrade to rules_python 1.7.0 (FAILS)

This demonstrates the regression in rules_python 1.7.0 where
%interpreter_args% template placeholders are not substituted for
external py_binary targets.

Building the same target now fails:

  bazel build @com_github_grpc_grpc//src/python/grpcio/grpc/_cython:cygrpc.pyx_cython_translation

Error:
  File ".../cython_binary", line 39
      %interpreter_args%
      ^
  SyntaxError: invalid syntax

Root cause: PR #3242 introduced new template variables that native
py_binary doesn't substitute.

Fix: bazel-contrib/rules_python#3495

Author: thomasdesr

WORKSPACE

@@ -2,12 +2,12 @@ workspace(name = "rules_python_3495_repro")
 
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 
-# rules_python 1.6.3 - works fine
+# rules_python 1.7.0 - has the regression (see PR #3495)
 http_archive(
     name = "rules_python",
-    sha256 = "2f5c284fbb4e86045c2632d3573fc006facbca5d1fa02976e89dc0cd5488b590",
-    strip_prefix = "rules_python-1.6.3",
-    url = "https://github.com/bazel-contrib/rules_python/releases/download/1.6.3/rules_python-1.6.3.tar.gz",
+    sha256 = "f609f341d6e9090b981b3f45324d05a819fd7a5a56434f849c761971ce2c47da",
+    strip_prefix = "rules_python-1.7.0",
+    url = "https://github.com/bazel-contrib/rules_python/releases/download/1.7.0/rules_python-1.7.0.tar.gz",
 )
 
 load("@rules_python//python:repositories.bzl", "py_repositories", "python_register_toolchains")