Add new flaky tests to pub.status.

sdk/lib/_internal/pub/pub.status

Index: sdk/lib/_internal/pub/pub.status
diff --git a/sdk/lib/_internal/pub/pub.status b/sdk/lib/_internal/pub/pub.status
index c53b76301145f6ea12d7afa4a696e9bd3b610d47..1d1dcd0b33745da3f69ccfa56092bdcfa3c618d3 100644
--- a/sdk/lib/_internal/pub/pub.status
+++ b/sdk/lib/_internal/pub/pub.status
@@ -9,17 +9,19 @@ test/oauth2/with_an_expired_credentials_refreshes_and_saves_test: Pass, Fail # I
 [ $runtime == vm && $system == macos ]
 test/hosted/remove_removed_dependency_test: Pass, Fail # Issue 12837
 test/hosted/remove_removed_transitive_dependency_test: Pass, Fail # Issue 12837
+test/hosted/version_negotiation_test: Pass, Fail # Issue 12837
 test/install/hosted/cached_pubspec_test: Pass, Fail # Issue 12837
 test/install/hosted/do_not_update_on_removed_constraints_test: Pass, Fail # Issue 12837
 test/install/hosted/install_test: Pass, Fail # Issue 12837
 test/install/hosted/install_transitive_test: Pass, Fail # Issue 12837
-test/install/hosted/version_negotiation_test: Pass, Fail # Issue 12837
 test/install/hosted/repair_cache_test: Pass, Fail # Issue 12837
-test/serve/serve_from_dependency_asset_test: Pass, Fail # Issue 12837
 test/install/hosted/stay_locked_if_new_is_satisfied_test: Pass, Fail # Issue 12837
+test/install/hosted/stay_locked_test: Pass, Fail # Issue 12837
 test/install/hosted/unlock_if_incompatible_test: Pass, Fail # Issue 12837
 test/install/hosted/unlock_if_new_is_unsatisfied_test: Pass, Fail # Issue 12837
-test/install/hosted/stay_locked_test: Pass, Fail # Issue 12837
+test/install/hosted/version_negotiation_test: Pass, Fail # Issue 12837
+test/serve/installs_first_if_path_dependency_changed_test: Pass, Fail # Issue 12837
+test/serve/serve_from_dependency_asset_test: Pass, Fail # Issue 12837
 
 # Pub only runs on the VM, so just rule out all compilers.
 [ $compiler == dart2js || $compiler == dart2dart ]