Merge pull request ocaml#22673 from ocaml/opam-2.1.4

Update the opam update warning after the release of opam 2.1.4

Author: mseri

repo

@@ -4,7 +4,7 @@ upstream: "https://github.com/ocaml/opam-repository/tree/master/"
 announce: [
 """
 [WARNING] opam is out-of-date. Please consider updating it (https://opam.ocaml.org/doc/Install.html)
-""" {(opam-version >= "2.1.0~~" & opam-version < "2.1.3") | opam-version < "2.0.10"}
+""" {(opam-version >= "2.1.0~~" & opam-version < "2.1.4") | opam-version < "2.0.10"}
 """
 [INFO] opam 2.1 includes many performance improvements over 2.0; please consider upgrading (https://opam.ocaml.org/doc/Install.html)
 """ {opam-version >= "2.0.10" & opam-version < "2.1.0~~"}