Convert std min to core min

SimonIT · SimonIT · commit 78a4a4b0fd1e · 2023-03-08T22:16:22.000+01:00
diff --git a/tests/preserve-encodings/tests.rs b/tests/preserve-encodings/tests.rs
@@ -640,7 +640,7 @@ mod tests {
 
     #[test]
     fn signed_ints() {
-        use std::cmp::min;
+        use core::cmp::min;
         let umins = [
             0i128,
             u8::MIN as i128,
