Disable external_import_test

Author: comius

examples/bzlmod/py_proto_library/BUILD.bazel

@@ -20,11 +20,12 @@ py_test(
 
 # Regression test for https://github.com/bazelbuild/rules_python/issues/2515
 #
-# This test failed before https://github.com/bazelbuild/rules_python/pull/2516
+# This test fails before protobuf 30.0 release
 # when ran with --legacy_external_runfiles=False (default in Bazel 8.0.0).
 native_test(
     name = "external_import_test",
     src = "@foo_external//:py_binary_with_proto",
+    tags = ["manual"],  # TODO: reenable when com_google_protobuf is upgraded
     # Incompatible with Windows: native_test wrapping a py_binary doesn't work
     # on Windows.
     target_compatible_with = select({