[Mapbox Java] changelog for v6.13.0-beta.1 (#1553)

Co-authored-by: root <root@b084c0a322ec>

Author: mapbox-github-ci-writer-public-1[bot]

CHANGELOG.md

@@ -4,8 +4,11 @@ Mapbox welcomes participation and contributions from everyone.
 
 ### main
 
+### v6.13.0-beta.1 - July 11, 2023
+
 - Added `StepIntersection.mergingArea`.
 
+
 ### v6.12.0 - May 30, 2023
 
 - No additional changes