Add migration note for ["geometry-type"] (maplibre#5290)

* Add migration note for `["geometry-type"]`

* Update CHANGELOG.md

Author: wipfli

CHANGELOG.md

@@ -17,6 +17,11 @@
 - ⚠️ Change drag rotate behavior to be around the center of the screen ([#5074](https://github.com/maplibre/maplibre-gl-js/pull/5074))
 - ⚠️ Return actual altitude from queryTerrainElevation + Pass non-translated matrices to custom layer on mercator map ([#3854](https://github.com/maplibre/maplibre-gl-js/pull/3854))
 - ⚠️ Changed `geometry-type` to identify "Multi-" features ([#4877](https://github.com/maplibre/maplibre-gl-js/pull/4877)). Use `$type` for non "Multi-" support or use `in` expression to get the previous behavior.
+Example:
+```diff
+- "filter": ["==", ["geometry-type"], "Polygon"]
++ "filter": ["==", "$type", "Polygon"]
+```
 - ⚠️ Remove unminified prod build ([#4906](https://github.com/maplibre/maplibre-gl-js/pull/4906)). You'll need to use a different build.
 - Allows setting the desired WebGL version to use ([#5236](https://github.com/maplibre/maplibre-gl-js/pull/5236)). You can now use `contextType` inside `canvasContextAttributes` to choose which WebGL version to use
 - Dual-Stack WebGL Runtime with WebGL2 to WebGL1 Fallback ([#5198](https://github.com/maplibre/maplibre-gl-js/pull/5198))