Set release date for 0.18 to Sep 26, 2024

Author: oleksandr-pavlyk

CHANGELOG.md

@@ -4,7 +4,7 @@ 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).
 
-## [0.18.0] - Sept. XX, 2024
+## [0.18.0] - Sept. 26, 2024
 
 This release reaches an important milestone by making offloading fully asynchronous.
 Calls to `dpctl.tensor` submit tasks for execution to DPC++ runtime and return without waiting for execution of these tasks to finish.