add missing bzl_library dep

Author: rickeylev

python/private/BUILD.bazel

@@ -361,6 +361,7 @@ bzl_library(
         ":common_labels.bzl",
         ":py_cc_toolchain_info_bzl",
         ":rules_cc_srcs_bzl",
+        ":sentinel_bzl",
         ":util_bzl",
         "@bazel_skylib//rules:common_settings",
     ],

python/private/py_cc_toolchain_info.bzl

@@ -74,7 +74,6 @@ attribute is available or not.
 
 If available, information about C libraries, struct with fields:
   * providers_map: A dict of string to provider instances. The key should be
-
     a fully qualified name (e.g. `@rules_foo//bar:baz.bzl#MyInfo`) of the
     provider to uniquely identify its type.