Remove unused py_internal load

Author: mai93

python/private/attributes.bzl

@@ -21,7 +21,6 @@ load(":common_labels.bzl", "labels")
 load(":enum.bzl", "enum")
 load(":flags.bzl", "PrecompileFlag", "PrecompileSourceRetentionFlag")
 load(":py_info.bzl", "PyInfo")
-load(":py_internal.bzl", "py_internal")
 load(":reexports.bzl", "BuiltinPyInfo")
 load(":rule_builders.bzl", "ruleb")