www/hs-postgrest: Update 13.0.4 => 13.0.6

Changelogs:

• https://github.com/PostgREST/postgrest/releases/tag/v13.0.5
• https://github.com/PostgREST/postgrest/releases/tag/v13.0.6

Approved by: yuri@ (Mentor)

Differential Revision: https://reviews.freebsd.org/D52337