CHORE: Align CHANGELOG versions

Author: mkholt

XrmPluginCore.SourceGenerator/CHANGELOG.md

@@ -2,10 +2,10 @@
 * Fix: XPC4003 has been reduced to Warning to allow initial build to succeed
 * Add: New rule XPC4006 (Error) to enforce handler signature correctness once generated types exist
 
-### v1.0.1 - 27 November 2025
+### v1.2.1 - 27 November 2025
 * Fix: Analyzer for XPC4005 to correctly identify lambda expressions in AddImage calls
 
-### v1.0.0 - 27 November 2025
+### v1.2.0 - 27 November 2025
 Initial release of XrmPluginCore SourceGenerator
 * Add: Type-Safe Images feature with compile-time enforcement via source generator
 * Add: Source analyzer rules with hotfixes and documentation to help use the Type-Safe Images feature correctly