Update Rust crate approx to 0.5.1 (#28)

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

Cargo.toml

@@ -16,7 +16,7 @@ minidom = "0.12.0"
 thiserror = "1.0"
 
 [dev-dependencies]
-approx = "0.5.0"
+approx = "0.5.1"
 criterion = "0.3.5"
 
 [[bench]]