Rollup merge of #146197 - RalfJung:triagebot-rustc_allow_const_fn_unstable, r=Urgau

triagebot: fix rustc_allow_const_fn_unstable matcher

The attribute is used like `#[rustc_allow_const_fn_unstable(const_precise_live_drops)]` so we can't have the final `]` here...

r? `@Urgau`

Author: matthiaskrgr

triagebot.toml

@@ -1313,7 +1313,7 @@ message = """
 and explores the possible non-determinism of the intrinsic.
 """
 cc = ["@rust-lang/miri"]
-[mentions."#[rustc_allow_const_fn_unstable]"]
+[mentions."#[rustc_allow_const_fn_unstable"]
 type = "content"
 message = """
 `#[rustc_allow_const_fn_unstable]` needs careful audit to avoid accidentally exposing unstable