Update packages/graphics/graphics.5.2.0/opam

Author: mseri

packages/graphics/graphics.5.2.0/opam

@@ -16,7 +16,7 @@ homepage: "https://github.com/ocaml/graphics"
 bug-reports: "https://github.com/ocaml/graphics/issues"
 x-maintenance-intent: ["(latest)"]
 depends: [
-  "dune" {>= "2.1"}
+  "dune" {>= "2.7"}
   "dune-configurator"
   "conf-libX11" {os != "win32"}
   "conf-libXft" {os != "win32"}