PHPMailer 6.6.2
This is a maintenance release.
- Don't clear errors on RSET, so they can still be obtained when using keepalive
- Bump some GitHub action versions
- Fix some tests
- Fix docs deployment GitHub action
- Updates to parallel-lint and console highlighter, thanks to @jrfnl
- 🇺🇦 Slava Ukraini!
Note that 6.6.1 was not released.