Log Message:
mail/roundcube: update to 1.6.4

1.6.4 (2023-10-16)

Security update.

- Fix PHP8 warnings (#9142, #9160)
- Fix default 'mime.types' path on Windows (#9113)
- Managesieve: Fix javascript error when relational or spamtest
  extension is not enabled (#9139)
- Fix cross-site scripting (XSS) vulnerability in handling of SVG in
  HTML messages (#9168)