[@types/three] Adds morphTargetInfluences and morphTargetDictionary to mesh on three-core.d.ts (#20490)

* Adds morphTargetInfluences and morphTargetDictionary to mesh class

* Replaces morphTargetDictionary object type in three-core.d.ts

types/three/three-core.d.ts

@@ -4837,6 +4837,8 @@ export class Mesh extends Object3D {
     geometry: Geometry|BufferGeometry;
     material: Material | Material[];
     drawMode: TrianglesDrawModes;
+    morphTargetInfluences?: number[];
+    morphTargetDictionary?: { [key: string]: number; };
 
     setDrawMode(drawMode: TrianglesDrawModes): void;
     updateMorphTargets(): void;