Update SSAARenderPass.d.ts

Fixed #20768.

examples/jsm/postprocessing/SSAARenderPass.d.ts

@@ -2,7 +2,8 @@ import {
 	Scene,
 	Camera,
 	Color,
-	ShaderMaterial
+	ShaderMaterial,
+	WebGLRenderTarget
 } from '../../../src/Three';
 
 import { Pass } from './Pass';
@@ -19,5 +20,6 @@ export class SSAARenderPass extends Pass {
 	copyUniforms: object;
 	copyMaterial: ShaderMaterial;
 	fsQuad: object;
+	sampleRenderTarget: undefined | WebGLRenderTarget;
 
 }