Disable starlark_repository_test on postsubmit

This test was disabled on presubmit in https://github.com/bazelbuild/bazel/pull/22351 but we forgot to make the corresponding change for postsubmit.
diff --git a/.bazelci/postsubmit.yml b/.bazelci/postsubmit.yml
index 320e593..d5f0c11 100644
--- a/.bazelci/postsubmit.yml
+++ b/.bazelci/postsubmit.yml
@@ -373,6 +373,7 @@
       - "-//src/test/py/bazel:bazel_yanked_versions_test"
       - "-//src/test/py/bazel:bzlmod_query_test"
       - "-//src/test/py/bazel:mod_command_test"
+      - "-//src/test/shell/bazel:starlark_repository_test"
       - "-//src/test/shell/bazel:verify_workspace"
     include_json_profile:
       - build