fix(pkg): missing location in rev store (#9681)

Signed-off-by: Rudi Grinberg <[email protected]>

<!-- ps-id: 3dda833b-38e2-415e-b1e0-f62ad2be2f75 -->

src/dune_pkg/opam_repo.ml

@@ -66,6 +66,7 @@ module Source = struct
               | Some `Head -> Some (Commitish.Branch ref)
               | None ->
                 User_error.raise
+                  ~loc
                   ~hints:
                     [ Pp.text
                         "Make sure the URL is correct and the repository contains the \