[Mapbox Java] changelog for v7.8.0 (#1623)

Co-authored-by: root <root@4ed23d2465b6>

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

CHANGELOG.md

@@ -3,8 +3,11 @@
 Mapbox welcomes participation and contributions from everyone.
 
 ### main
+
+### v7.8.0 - August 28, 2025
 - Add `StepIntersection#duration` (previously available through `StepIntersection#getUnrecognizedProperty("duration")`)
 
+
 ### v7.7.0 - August 13, 2025
 - Add `RouteLeg#notifications`