fix typo in diffast-langs-common.0.1 dependencies

Author: hannesm

packages/diffast-langs-common/diffast-langs-common.0.1/opam

@@ -19,7 +19,7 @@ depends: [
   "ocaml" {>= "4.14"}
   "dune" {>= "3.17"}
   "sedlex"
-  "mehirLib"
+  "menhirLib"
   "diffast-misc" {= version}
   "vlt" {>= "0.2.4"}
   "odoc" {with-doc}