Adapted changelog to new release date

Author: sebastian-peter

CHANGELOG.md

@@ -6,7 +6,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased/Snapshot]
 
-## [3.0.0] - 2023-01-30
+## [3.0.0] - 2023-02-16
 
 ### Added
 - SQL time series sources (`SqlTimeSeriesSource` and `SqlTimeSeriesMappingSource`) [#467](https://github.com/ie3-institute/PowerSystemDataModel/issues/467)