Only allow patch updates to the sys crate

Use the `~` version specifier, which only allows changes in the last digit of
the version. Additionally, force use of version `4.1.1`+, as `4.1.0`
incorrectly claimed the library version in the c code

croaring/Cargo.toml

@@ -25,7 +25,7 @@ roaring = "0.10"
 criterion = { version = "0.5", features = ["html_reports"] }
 
 [dependencies]
-ffi = { package = "croaring-sys", path = "../croaring-sys", version = "4.1.0" }
+ffi = { package = "croaring-sys", path = "../croaring-sys", version = "~4.1.1" }
 
 [[bench]]
 name = "benches"