Remove vuln and unmaintained dep 'inflight'

> `inflight` is unmaintained and [has a security vulnerability](https://security.snyk.io/vuln/SNYK-JS-INFLIGHT-6095116). Ideally it would be removed altogether.
>  

 _Originally posted by @revmischa in [#333](https://github.com/awslabs/aws-crt-nodejs/issues/333#issuecomment-2784689693)_