fixup! add DateTime<Utc> protobuf encoding

Increase the number of test cases to 4096 from the default 256.

src/repr/src/proto/chrono.rs

@@ -165,24 +165,22 @@ mod tests {
     use proptest::prelude::*;
 
     proptest! {
+        #![proptest_config(ProptestConfig::with_cases(4096))]
+
         #[test]
         fn naive_date_time_protobuf_roundtrip(expect in any_naive_datetime() ) {
             let actual =  protobuf_repr_roundtrip(&expect);
             assert!(actual.is_ok());
             assert_eq!(actual.unwrap(), expect);
         }
-    }
 
-    proptest! {
         #[test]
         fn date_time_protobuf_roundtrip(expect in any_datetime() ) {
             let actual =  protobuf_repr_roundtrip(&expect);
             assert!(actual.is_ok());
             assert_eq!(actual.unwrap(), expect);
         }
-    }
 
-    proptest! {
         #[test]
         fn fixed_offset_protobuf_roundtrip(expect in any_fixed_offset() ) {
             let actual =  protobuf_repr_roundtrip(&expect);