Enable serde feature of chrono dependency in restate-types

Author: tillrohrmann

crates/types/Cargo.toml

@@ -39,7 +39,7 @@ bytes = { workspace = true }
 bytestring = { workspace = true }
 bilrost = { workspace = true, features = ["bytestring"] }
 bincode = { workspace = true, default-features = false, features = ["std", "serde"] }
-chrono = { workspace = true }
+chrono = { workspace = true, features = ["serde"] }
 clap = { workspace = true, features = ["std", "derive", "env"], optional = true }
 codederror = { workspace = true }
 dashmap = { workspace = true }