Update CHANGELOG.md

Author: vaind

CHANGELOG.md

@@ -1,13 +1,11 @@
 # Changelog
 
-## 2.13.0
+## 2.12.0
 
 ### Features
 
 - Gzip-compressed HTTP requests ([#88](https://github.com/getsentry/github-workflows/pull/88))
 
-## 2.12.0
-
 ### Fixes
 
 - Don't update from a manually-updated prerelease to a latest stable release that is earlier than the prerelease ([#78](https://github.com/getsentry/github-workflows/pull/78))