www/rubygem-jekyll: Fix RUN_DEPENDS

• Does not work with the latest liquid release so depend on textproc/rubygem-liquid3
• Does not work with the latest rouge release so depend on textproc/rubygem-rouge1

PR: 213500
Reported by: freebsdbug@patpro.net
Reviewed by: mat
Approved by: mat
Differential Revision: https://reviews.freebsd.org/D8978