Remove opam pin <compiler> to avoid issues with opam 2.1#150

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kit-ty-kate wants to merge 1 commit intoocurrent:masterfrom kit-ty-kate:patch-1

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Commits on Jan 18, 2022

Remove opam pin <compiler> to avoid issues with opam 2.1 (see ocaml/opam#4501 )
kit-ty-kate
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