CI: Pin doesn't work?

Author: Julow

tools/build-mingw64.sh

@@ -44,8 +44,7 @@ eval $(opam env)
 
 cd ..
 
-opam pin add -yn ocamlformat-lib .
-opam install -y --deps-only ./ocamlformat.opam
+opam install -y ./ocamlformat-lib.opam ./ocamlformat.opam
 
 dune subst
 dune build -p ocamlformat-lib,ocamlformat @install