remove redundant imports

Author: matheus-consoli

src/future/join/vec.rs

@@ -181,8 +181,6 @@ mod test {
     use alloc::sync::Arc;
     use alloc::vec;
     use core::future;
-    use core::future::Future;
-    use core::task::Context;
 
     #[test]
     fn smoke() {

src/future/race_ok/vec/mod.rs

@@ -95,7 +95,6 @@ where
 
 #[cfg(test)]
 mod test {
-    use super::error::AggregateError;
     use super::*;
     use alloc::vec;
     use core::future;