postgresql update - 2021-08-12

[ImreSamu]

• rename 14beta2-3.1 => 14beta3-3.1
• make update
• manually update alpine postgis to 3.1.3 ( debian is still 3.1.2 ) ( avoiding FuncnameGetCandidates errors )
  • related: https://trac.osgeo.org/postgis/ticket/4927
  • the same fix in beta2 : add postgis/postgis:14beta2-3.1 versions #249

( context: https://www.postgresql.org/about/news/postgresql-134-128-1113-1018-9623-and-14-beta-3-released-2277/ )

[ImreSamu]

ready to review / merge

[phillipross]

thanks for the update!