chore(release): v2.80.0 (#3648)

Signed-off-by: venilinvasilev <venilin.vasilev@gmail.com>

Author: venilinvasilev

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+# 2.80.0
+
+### Fixed
+- Fixed an integer overflow issue where `validStart` and `expirationTime` (Unix seconds stored as 64-bit values) were incorrectly converted using `Long.toInt()`, causing dates beyond `2^32−1` seconds (e.g., year 2125) to decode incorrectly (e.g., as 1988). `ExchangeRate` and `ExpirationTime` now correctly use 64-bit values. [#3641](https://github.com/hiero-ledger/hiero-sdk-js/pull/3641)
+- Resolved a race condition in node health handling where concurrent failures could repeatedly increase backoff and mark a node unhealthy for an excessive duration. Backoff is now only increased when the node is healthy, preventing runaway backoff under high concurrency. [#3647](https://github.com/hiero-ledger/hiero-sdk-js/pull/3647)
+
 # 2.80.0-beta.1
 
 ### Changed

package.json

@@ -1,6 +1,6 @@
 {
     "name": "@hiero-ledger/sdk",
-    "version": "2.80.0-beta.3",
+    "version": "2.80.0",
     "description": "Hiero SDK",
     "types": "./lib/index.d.ts",
     "main": "./lib/index.cjs",