Log Message:
Update to version 3.0.4.
This solves the update request in PR pkg/30452.

No pkgsrc related changes. This release fixes a recently reported DoS
vulnerability.

Highlights of the release
-------------------------
 - Certain invalid "Content-Type" headers would cause SpamAssassin to
   incorrectly process parts of the message.
 - Certain long message headers could cause slowness when parsing the message.
 - Added in SURBL JP list.
 - URI anti-obfuscation updates.
 - Additional bug fixes.