rustbot: Allow applying relnotes label

Inspired by https://github.com/rust-lang/rust/pull/90521 , and by the
various `must_use` PRs; in all of those cases, the submitter of the PR
could know that `relnotes` applied, but couldn't apply it themselves.

diff --git a/triagebot.toml b/triagebot.toml
index 48c7a00de7830c83e4659f49f35358049949fea1..3f151ba1695008a27a2304ec0b29b605bb0c7f67 100644 (file)
--- a/triagebot.toml
+++ b/triagebot.toml
@@ -2,6 +2,7 @@
 allow-unauthenticated = [
     "C-*", "A-*", "E-*", "NLL-*", "O-*", "S-*", "T-*", "WG-*", "F-*",
     "D-*",
 allow-unauthenticated = [
     "C-*", "A-*", "E-*", "NLL-*", "O-*", "S-*", "T-*", "WG-*", "F-*",
     "D-*",

+    "relnotes",

     "requires-nightly",
     "regression-*",
     "perf-*",
     "requires-nightly",
     "regression-*",
     "perf-*",