silence a new clippy warning from rust 1.62 for now (#7384)

Author: alex

tox.ini

@@ -60,5 +60,8 @@ allowlist_externals =
     cargo
 commands =
     cargo fmt --all -- --check
-    cargo clippy -- -D warnings
+    # Temporarily allow clippy::drop-non-drop until
+    # https://github.com/joshua-maros/ouroboros/pull/63 is merged and
+    # released.
+    cargo clippy -- -D warnings --allow clippy::drop-non-drop
     cargo test --no-default-features