[maps-android] add changelog entries for v11.21.0-rc.1 (#11451)

GitOrigin-RevId: 6428f176e0b5b26f82529335d812caf325649312

Author: natiginfo

CHANGELOG.md

@@ -9,6 +9,14 @@ Mapbox welcomes participation and contributions from everyone.
 # 11.21.0-rc.1 March 23, 2026
 ## Bug fixes 🐞
 * Fix native memory leak in `AnnotationManager` where bitmap style images were not removed onDestroy.
+* Fix feature cutout rendering artifacts on some devices caused by insufficient shader precision.
+* Fix rendering of stacked underground 3D roads.
+* Fix a crash that could occur when the map is destroyed during style loading.
+* Fix underground road geometry being clipped in orthographic projection with small viewports.
+* Fix map flickering caused by stencil buffer conflicts between raster and hillshade layers.
+* Fix potential ANRs when receiving location updates under heavy system load.
+* Fix a bug in eviction logic for TileStore.
+* Internal fixes and performance improvements.
 
 
 ## Dependencies