fix: use runfiles_root_path in stage2 bootstrap

Author: rickeylev

python/private/py_executable.bzl

@@ -768,10 +768,7 @@ def _create_stage1_bootstrap(
     }
 
     if stage2_bootstrap:
-        subs["%stage2_bootstrap%"] = "{}/{}".format(
-            ctx.workspace_name,
-            stage2_bootstrap.short_path,
-        )
+        subs["%stage2_bootstrap%"] = runfiles_root_path(ctx, stage2_bootstrap.short_path)
         template = runtime.bootstrap_template
         subs["%shebang%"] = runtime.stub_shebang
     elif not ctx.files.srcs: