driveby: fix use of indexmap remove

We do care about the order of things in this
set, in general, so use `shift_remove`.

components/salsa-2022/src/runtime/active_query.rs

@@ -123,7 +123,7 @@ impl ActiveQuery {
     pub(super) fn remove_cycle_participants(&mut self, cycle: &Cycle) {
         for p in cycle.participant_keys() {
             let p: DependencyIndex = p.into();
-            self.input_outputs.remove(&(EdgeKind::Input, p));
+            self.input_outputs.shift_remove(&(EdgeKind::Input, p));
         }
     }
 

src/runtime.rs

@@ -618,7 +618,7 @@ impl ActiveQuery {
     fn remove_cycle_participants(&mut self, cycle: &Cycle) {
         if let Some(my_dependencies) = &mut self.dependencies {
             for p in cycle.participant_keys() {
-                my_dependencies.remove(&p);
+                my_dependencies.shift_remove(&p);
             }
         }
     }