Set up OCaml

Version updated for ocaml/setup-ocaml to version v2.2.9.

• This action is used across all versions by 1,091 repositories.

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Release notes

Changed

• Do not explicitly call the depext subcommand unless required.
• Do not set HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK to 1 while installing OCaml.
• Update runtime dependencies.

• ocaml
• GitHub Actions