Fix stale lint expectations.

Signed-off-by: Jason Volk <jason@zemos.net>

src/core/matrix/state_res/resolve/tests.rs

@@ -726,7 +726,6 @@ fn JOIN_RULE() -> HashMap<OwnedEventId, PduEvent> {
 
 macro_rules! state_set {
     ($($kind:expr => $key:expr => $id:expr),* $(,)?) => {{
-        #[expect(unused_mut)]
         let mut x = StateMap::new();
         $(
             x.insert(($kind, $key.into()), $id);

src/core/matrix/state_res/test_utils.rs

@@ -248,7 +248,6 @@ pub(super) async fn do_check(
 	assert_eq!(expected_state, end_state);
 }
 
-#[expect(clippy::exhaustive_structs)]
 pub(super) struct TestStore(pub(super) HashMap<OwnedEventId, PduEvent>);
 
 impl TestStore {
@@ -286,7 +285,6 @@ impl TestStore {
 }
 
 // A StateStore implementation for testing
-#[expect(clippy::type_complexity)]
 impl TestStore {
 	pub(super) fn set_up(
 		&mut self,