chore: remove unnecessary DEFAULT_BOOTSTRAP_TEMPLATE global

Author: rickeylev

python/private/py_runtime_info.bzl

@@ -17,8 +17,6 @@ load(":util.bzl", "define_bazel_6_provider")
 
 DEFAULT_STUB_SHEBANG = "#!/usr/bin/env python3"
 
-DEFAULT_BOOTSTRAP_TEMPLATE = Label("//python/private:bootstrap_template")
-
 _PYTHON_VERSION_VALUES = ["PY2", "PY3"]
 
 def _optional_int(value):

python/private/py_runtime_rule.bzl

@@ -201,7 +201,7 @@ If not set, then it will be set based on flags.
             ),
             "bootstrap_template": attr.label(
                 allow_single_file = True,
-                default = DEFAULT_BOOTSTRAP_TEMPLATE,
+                default = Label("//python/private:bootstrap_template"),
                 doc = """
 The bootstrap script template file to use. Should have %python_binary%,
 %workspace_name%, %main%, and %imports%.