nix: Remove postgis extension

Author: wolfgangwalther

Diff for: default.nix

@@ -55,11 +55,11 @@ let
 
   postgresqlVersions =
     [
-      { name = "postgresql-16"; postgresql = pkgs.postgresql_16.withPackages (p: [ p.postgis p.pg_safeupdate ]); }
-      { name = "postgresql-15"; postgresql = pkgs.postgresql_15.withPackages (p: [ p.postgis p.pg_safeupdate ]); }
-      { name = "postgresql-14"; postgresql = pkgs.postgresql_14.withPackages (p: [ p.postgis p.pg_safeupdate ]); }
-      { name = "postgresql-13"; postgresql = pkgs.postgresql_13.withPackages (p: [ p.postgis p.pg_safeupdate ]); }
-      { name = "postgresql-12"; postgresql = pkgs.postgresql_12.withPackages (p: [ p.postgis p.pg_safeupdate ]); }
+      { name = "postgresql-16"; postgresql = pkgs.postgresql_16.withPackages (p: [ p.pg_safeupdate ]); }
+      { name = "postgresql-15"; postgresql = pkgs.postgresql_15.withPackages (p: [ p.pg_safeupdate ]); }
+      { name = "postgresql-14"; postgresql = pkgs.postgresql_14.withPackages (p: [ p.pg_safeupdate ]); }
+      { name = "postgresql-13"; postgresql = pkgs.postgresql_13.withPackages (p: [ p.pg_safeupdate ]); }
+      { name = "postgresql-12"; postgresql = pkgs.postgresql_12.withPackages (p: [ p.pg_safeupdate ]); }
     ];
 
   # Dynamic derivation for PostgREST