feat: support new rocks.nvim preload hook API

[mrcjkb]

See https://github.com/nvim-neorocks/rocks.nvim/pull/392 (will need to be merged first, so we can update the flake.lock here).

Note: This is backward compatible, so we don't need to bump the minimum required rocks.nvim version.

[github-actions[bot]]

Review Checklist

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Proper conventional commit scoping:

• For example, fix(installer): some installer bugfix

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If applicable:

• [ ] Tested
  • [ ] Tests have been added.
  • [ ] Tested manually (steps in PR description).
• [ ] Updated documentation.

[mrcjkb]

Merging, as this is trivial.