Fix labeler.yml

[mosuem]

See dart-lang/native#873

---

• I’ve reviewed the contributor guide and applied the relevant portions to this PR.

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[polina-c]

@devoncarew , can you take a look. I am not experienced enough in this area.

[devoncarew]

👍

[polina-c]

@mosuem , can you fix failure of 'Pull Request Labeler / label (pull_request_target)'?
And merge handling of deprecated member from here: #203

[devoncarew]

The failure for the Pull Request Labeler / label bit won't be fixed until this PR lands. I believe it won't use the new config until it's on master.

[polina-c]

The failure for the Pull Request Labeler / label bit won't be fixed until this PR lands. I believe it won't use the new config until it's on master.

Ok, merging in spite of failures.