zoneinfo64 transitions APIs (#6884)

Author: robertbastian

Cargo.lock

@@ -28,6 +28,8 @@ chrono = { version = "0.4", optional = true }
 
 [dev-dependencies]
 chrono-tz = "0.10.4"
+itertools.workspace = true
+jiff = { version = "0.2.15", default-features = false, features = ["tzdb-bundle-always", "std"] }
 
 [features]
 chrono = ["dep:chrono"]

utils/zoneinfo64/Cargo.toml

@@ -199,7 +199,7 @@ pub struct TzZoneDataRaw<'a> {
     )]
     final_rule: Option<&'a PotentialUtf16>,
     final_raw: Option<i32>,
-    final_year: Option<u32>,
+    final_year: Option<i32>,
     #[allow(dead_code)]
     #[serde(
         borrow,