fix release date (#508)

Author: jaeopt

CHANGELOG.md

@@ -1,7 +1,7 @@
 # Optimizely Java X SDK Changelog
 
 ## [3.10.3]
-March 10th, 2023
+March 13th, 2023
 
 ### Fixes
 We updated our README.md and other non-functional code to reflect that this SDK supports both Optimizely Feature Experimentation and Optimizely Full Stack ([#506](https://github.com/optimizely/java-sdk/pull/506)).