Set upper bound for fmt in the current ACGtk release (it seems the dependency to fmt is now explicitly required, fmt.tty is not enough). Also set the x-maintenance-intent status (#27605)

Author: mseri

packages/acgtk/acgtk.2.1.0/opam

@@ -1,5 +1,6 @@
 opam-version: "2.0"
 maintainer: "[email protected]"
+x-maintenance-intent: ["(latest)"]
 
 build: [
   ["dune" "subst"] {dev}
@@ -14,7 +15,7 @@ depends: [
   "menhir" { >= "20211230"}
   "ocamlgraph"
   "ANSITerminal" { >= "0.8" }
-  "fmt"
+  "fmt" { <= "0.9.0" }
   "logs"
   "mtime" { >= "2.0.0"}
   "cmdliner" { >= "1.1.0"}