fix: explicitely type promise

Author: steabert

lib/components/recorder/index.ts

@@ -24,7 +24,7 @@ export class Recorder extends Tube {
     const streamsFinished = []
     for (const [key, value] of Object.entries(interleaved)) {
       streamsFinished.push(
-        new Promise((resolve) =>
+        new Promise<void>((resolve) =>
           value.on('finish', () => {
             const timestamp = Date.now()
             const message = null