Sync generated opam file

Author: mmottl

postgresql.opam

@@ -15,7 +15,7 @@ doc: "https://mmottl.github.io/postgresql-ocaml/api"
 bug-reports: "https://github.com/mmottl/postgresql-ocaml/issues"
 depends: [
   "dune" {>= "2.7"}
-  "ocaml" {>= "4.12"}
+  "ocaml" {>= "5.00"}
   "dune-compiledb"
   "dune-configurator"
   "conf-postgresql" {build}