fix(sdk): [nan-1474] type sdk and remove return coercion (#2553)

## Describe your changes
Follow up to make sure we type the node-client as well

## Issue ticket number and link
NAN-1474

## Checklist before requesting a review (skip if just adding/editing
APIs & templates)
- [ ] I added tests, otherwise the reason is: 
- [ ] I added observability, otherwise the reason is:
- [ ] I added analytics, otherwise the reason is:

packages/node-client/lib/index.ts

@@ -683,7 +683,7 @@ export class Nango {
      * @param input - An optional input data for the action
      * @returns A promise that resolves with an object containing the response data from the triggered action
      */
-    public async triggerAction(providerConfigKey: string, connectionId: string, actionName: string, input?: unknown): Promise<object> {
+    public async triggerAction<In = unknown, Out = object>(providerConfigKey: string, connectionId: string, actionName: string, input?: In): Promise<Out> {
         const url = `${this.serverUrl}/action/trigger`;
 
         const headers = {

packages/shared/lib/sdk/sync.ts

@@ -740,7 +740,7 @@ export class NangoAction {
     }
 
     public async triggerAction<In = unknown, Out = object>(providerConfigKey: string, connectionId: string, actionName: string, input?: In): Promise<Out> {
-        return (await this.nango.triggerAction(providerConfigKey, connectionId, actionName, input)) as Out;
+        return await this.nango.triggerAction(providerConfigKey, connectionId, actionName, input);
     }
 
     public async triggerSync(providerConfigKey: string, connectionId: string, syncName: string, fullResync?: boolean): Promise<void | string> {