refactor: replace futures with futures-executor

Author: paolobarbolini

Cargo.lock

@@ -39,7 +39,7 @@ regex          = { version = "1.5.1", default-features = false, features = ["std
 # Optional dependencies
 rayon = { version = "1.3", optional = true }
 csv = { version = "1.1", optional = true }
-futures = { version = "0.3", default-features = false, features = ["executor"], optional = true }
+futures-executor = { version = "0.3", optional = true }
 smol = { version = "2.0", default-features = false, optional = true }
 tokio = { version = "1.0", default-features = false, features = [
   "rt",
@@ -57,7 +57,6 @@ tempfile   = "3.5.0"
 approx     = "0.5.0"
 quickcheck = { version = "1.0", default-features = false }
 rand       = "0.8"
-futures    = "0.3"
 
 [badges]
 maintenance = { status = "passively-maintained" }
@@ -87,7 +86,7 @@ async = []
 
 # These features enable built-in support for running async benchmarks on each different async
 # runtime.
-async_futures = ["dep:futures", "async"]
+async_futures = ["dep:futures-executor", "async"]
 async_smol    = ["dep:smol", "async"]
 async_tokio   = ["dep:tokio", "async"]
 async_std     = ["dep:async-std", "async"]

Cargo.toml

@@ -28,7 +28,7 @@ pub struct FuturesExecutor;
 #[cfg(feature = "async_futures")]
 impl AsyncExecutor for FuturesExecutor {
     fn block_on<T>(&self, future: impl Future<Output = T>) -> T {
-        futures::executor::block_on(future)
+        futures_executor::block_on(future)
     }
 }