add bos lower bound for scfg

Author: zapashcanon

packages/scfg/scfg.0.4/opam

@@ -13,6 +13,8 @@ doc: "https://doc.zapashcanon.fr/scfg"
 bug-reports: "https://git.zapashcanon.fr/zapashcanon/scfg/issues"
 depends: [
   "dune" {>= "2.9"}
+  "bos" {>= "0.2.1"}
+  "path"
   "cmdliner" {>= "1.3.0"}
   "fmt" {>= "0.9.0"}
   "menhir" {>= "20211230"}