@uppy/core: fix types (#4072)

packages/@uppy/core/types/index.d.ts

@@ -360,8 +360,8 @@ export class Uppy {
 
   getID(): string
 
-  use<TOptions, TInstance extends UIPlugin | BasePlugin>(
-    pluginClass: new (uppy: this, opts: TOptions) => TInstance,
+  use<TOptions extends PluginOptions, TInstance extends UIPlugin | BasePlugin<TOptions>>(
+    pluginClass: new (uppy: this, opts?: TOptions) => TInstance,
     opts?: TOptions
   ): this