chore(types): move expect-type to dependencies

[mmkal]

Description

Previously, it was in devDependencies which meant it was bundled and shipped as part of vitest. It's better for it to live in dependencies:

• non-breaking versions can be used by consumers if they want
• customisable via package.json overrides, .pnpmfile.cjs etc.
• security fixes can be applied

Please don't delete this checklist! Before submitting the PR, please make sure you do the following:

• It's really useful if your PR references an issue where it is discussed ahead of time. If the feature is substantial or introduces breaking changes without a discussion, PR might be closed. chore(deps): bump expect-type to v1 #6349 (comment)
• [ ] Ideally, include a test that fails without this PR but passes with it.
• [ ] Please, don't make changes to pnpm-lock.yaml unless you introduce a new test example.

Tests

• Run the tests with pnpm test:ci.
• I published a pkg.pr.new release and it works ok: https://pkg.pr.new/mmkal/vitest@fd3e17a

Documentation

• [ ] If you introduce new functionality, document it. You can run documentation with pnpm run docs command.

Changesets

• Changes in changelog are generated from PR name. Please, make sure that it explains your changes in an understandable manner. Please, prefix changeset messages with feat:, fix:, perf:, docs:, or chore:.

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