fix: add .trim()

Author: aduh95

lib/promote_release.js

@@ -390,8 +390,9 @@ export default class ReleasePromotion extends Session {
       '-m',
       `PR-URL: https://github.com/nodejs/node/pull/${prid}`
     ], { ignoreFailure: false });
-    return forceRunAsync('git', ['rev-parse', 'HEAD'],
+    const workingOnNewReleaseCommit = await forceRunAsync('git', ['rev-parse', 'HEAD'],
       { ignoreFailure: false, captureStdout: true });
+    return workingOnNewReleaseCommit.trim();
   }
 
   async pushToRemote(workingOnNewReleaseCommit) {