cleanup

- fix some warnings and mark others as expected
- make use of the msrv bump to 1.93.1 and cleanup compat and workarounds

.github/actions/setup-rust/cleanup.sh

@@ -4,7 +4,7 @@ set -e
 echo Cleanup workspace build artifacts and extra target output
 
 # clean just the direct members of the current workspace, use cargo metadata to generalize to all rust projects
-cargo clean -p `cargo metadata --no-deps --offline --format-version 1 | jq -r '[.workspace_members[]|split(" ")|.[0]]|join(" ")'`
+cargo clean --workspace
 
 # remove directories in /target/ that are not named `debug` or `release`
 before=`du -s target | awk '{print $1}'`