Bump futures from 0.3.4 to 0.3.5

Bumps [futures](https://github.com/rust-lang/futures-rs) from 0.3.4 to 0.3.5.
- [Release notes](https://github.com/rust-lang/futures-rs/releases)
- [Changelog](https://github.com/rust-lang/futures-rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang/futures-rs/compare/0.3.4...0.3.5)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

crates/async-std-resolver/Cargo.toml

@@ -66,7 +66,7 @@ path = "src/lib.rs"
 [dependencies]
 async-std = "1.0"
 async-trait = "0.1.27"
-futures = { version = "0.3.4", default-features = false, features = ["std"] }
+futures = { version = "0.3.5", default-features = false, features = ["std"] }
 trust-dns-resolver = { version = "0.20.0", path = "../resolver", default-features = false }
 
 [dev-dependencies]