fix: unhandledRejection (#9472)

Co-authored-by: Michael Kriese <michael.kriese@visualon.de>

lib/renovate.ts

 #!/usr/bin/env node
 
+import { logger } from './logger';
 import * as proxy from './proxy';
 import * as globalWorker from './workers/global';
 
+// istanbul ignore next
+process.on('unhandledRejection', (err) => {
+  logger.error({ err }, 'unhandledRejection');
+});
+
 proxy.bootstrap();
 
 // eslint-disable-next-line @typescript-eslint/no-floating-promises