security/rkhunter: Update to 1.4.6

Some files can be updated when running rkhunter. Do not track them
in the plist.

Changes: https://sourceforge.net/p/rkhunter/rkh_code/ci/version-1.4.6/tree/files/CHANGELOG
PR: 227837
Submitted by: lukasz@wasikowski.net (maintainer)