fix no_std (after futures-buffered accepts conradludgate/futures-buffered#9)

Author: Easyoakland

Cargo.toml

@@ -28,13 +28,13 @@ harness = false
 
 [features]
 default = ["std"]
-std = ["alloc"]
-alloc = ["dep:fixedbitset", "dep:slab", "dep:smallvec"]
+std = ["alloc", "futures-lite/std"]
+alloc = ["dep:fixedbitset", "dep:slab", "dep:smallvec", "futures-lite/alloc"]
 
 [dependencies]
 fixedbitset = { version = "0.5.7", default-features = false, optional = true }
 futures-core = { version = "0.3", default-features = false }
-futures-lite = "1.12.0"
+futures-lite = { version = "1.12.0", default-features = false }
 pin-project = "1.0.8"
 slab = { version = "0.4.8", optional = true }
 smallvec = { version = "1.11.0", optional = true }