Add unsound advisory for Tokio 7232 (#2272)

Author: Darksonn

crates/tokio/RUSTSEC-0000-0000.md

@@ -0,0 +1,22 @@
+```toml
+[advisory]
+id = "RUSTSEC-0000-0000"
+package = "tokio"
+date = "2025-04-07"
+url = "https://github.com/tokio-rs/tokio/pull/7232"
+informational = "unsound"
+categories = ["memory-corruption"]
+
+[versions]
+patched = [">= 1.38.2, < 1.39.0", ">= 1.43.1, < 1.44.0", ">= 1.44.2"]
+unaffected = ["< 0.2.5"]
+```
+
+# Broadcast channel calls clone in parallel, but does not require `Sync`
+
+The broadcast channel internally calls `clone` on the stored value when
+receiving it, and only requires `T:Send`. This means that using the broadcast
+channel with values that are `Send` but not `Sync` can trigger unsoundness if
+the `clone` implementation makes use of the value being `!Sync`.
+
+Thank you to Austin Bonander for finding and reporting this issue.