[ews-app]: Use python3 supported BeautifulSoup.
Pull request: https://github.com/WebKit/WebKit/pull/5546
Committed 255752@main (564b751dc275): <https://commits.webkit.org/255752@main> Reviewed commits have been landed. Closing PR #5546 and removing active labels.
<rdar://problem/101349958>
Restarted ews-app to pick up this change.