MFH: r564995

www/oauth2-proxy: Update to v7.0.1

Fixes CVE-2021-21291.

Changes: https://github.com/oauth2-proxy/oauth2-proxy/releases/tag/v7.0.1

PR: 253247
Submitted by: Matthias Wolf <freebsd AT rheinwolf DOT de> (maintainer)
Approved by: portmgr (security blanket)