Update Rust crate futures to 0.3.28

Author: renovate-bot

Cargo.toml

@@ -10,7 +10,7 @@ indicatif = "0.17.4"
 itertools = "0.10.5"
 kdbx4 = "0.5.1"
 rpassword = "7.2.0"
-futures = "0.3.27"
+futures = "0.3.28"
 rayon = "1.7.0"
 lazy_static = "1.4.0"
 sha-1 = "0.10.1"