Fix « The native git_repository rule is deprecated » error

[harobed]

Fix « ERROR: error loading package '': Encountered error while reading extension file 'python/pip.bzl': no such package '@io_bazel_rules_python//python': The native git_repository rule is deprecated. load("@bazel_tools//tools/build_defs/repo:git.bzl", "git_repository") for a replacement. » error