chore: Update float-cmp to 0.6

Author: igor-raits

Cargo.toml

@@ -33,5 +33,5 @@ rust-ini = { version = "0.13", optional = true }
 
 [dev-dependencies]
 serde_derive = "1.0.8"
-float-cmp = "0.4"
+float-cmp = "0.6"
 chrono = { version = "0.4", features = ["serde"] }