Bump ocaml/setup-ocaml from 2 to 3

[dependabot[bot]]

Bumps ocaml/setup-ocaml from 2 to 3.

Release notes

Sourced from ocaml/setup-ocaml's releases.

v3.0.0

• This was a version bump only, there were no code changes.

v3.0.0-beta1

Fixed

• Fix asset selector to select the correct opam release asset.

v3.0.0-beta

Changed

• Always set-up Cygwin whether or not the cache is hit.

v3.0.0-alpha

Added

• Add initial support for opam 2.2 on Windows.

v2.2.10

Changed

• Update runtime dependencies.

v2.2.9

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.

v2.2.8

Changed

• Update runtime dependencies.

v2.2.7

Changed

• Update runtime dependencies.

v2.2.6

Changed

• Update runtime dependencies.

v2.2.5

Changed

• Update runtime dependencies.

... (truncated)

Changelog

Sourced from ocaml/setup-ocaml's changelog.

[2.0.13]

Fixed

• Ensure cache key creation works with local opam repositories.

[2.0.12]

Changed

• Use ocaml-opam/opam-repository-mingw instead of fdopen/opam-repository-mingw.

Fixed

• Fix in 2.0.11 for hashing caused an invalid git configuration to be written.

[2.0.11]

Changed

• Don't install Cygwin's git or mercurial packages (reduces cache by ~90MB).

Fixed

• Ensure ocaml/opam-repository can be added without getting hash errors.

[2.0.10]

Fixed

• Speed up caching and get rid of bugs and hacks on Windows.

[2.0.9]

Fixed

• Take the sandbox option value into account when computing the cache key.

[2.0.8]

Changed

• Make the retry handling around unix package installation simple back.

Fixed

• Make the retry handling around depext package installation more robust.

[2.0.7]

... (truncated)

Commits

• 1b6abc9 Prepare 3.0.9
• 99c6818 Update npm deps
• 364899e Merge pull request #868 from ocaml/dependabot/github_actions/github/codeql-ac...
• 6bd77ff Merge pull request #867 from ocaml/dependabot/github_actions/actions/setup-no...
• d59dc0f Bump github/codeql-action from 3.26.7 to 3.26.8
• 6be3389 Bump actions/setup-node from 4.0.3 to 4.0.4
• 88bee13 Update npm deps
• cce8a9d Merge pull request #864 from ocaml/dependabot/github_actions/github/codeql-ac...
• 99b9ac2 Bump github/codeql-action from 3.26.6 to 3.26.7
• a24440e Update npm deps
• Additional commits viewable in compare view

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[dependabot[bot]]

The following labels could not be found: dependencies, no changelog.

[hhugo]

I would expect some cleanup to happen here. Opam-depext is no longer a thing. Also, I'm surprised to see opam cache done manually.