Add `typescript@rc` to test for `typescript@5.4`

[jpwilliams]

Summary

Adds typescript@rc (currently typescript@5.4.0). This is used to test the 5.4 release candidate to resolve any issues before it ships. When it does, we'll move this PR to target typescript@5.4.0 and merge, including a changeset if any changes needed to be made.

We should ship this change once the final build is submitted at the beginning of March. See microsoft/TypeScript#56948

Checklist

• [ ] ~Added a docs PR that references this PR~ N/A
• [x] Added unit/integration tests
• [x] Added changesets if applicable

Related

• microsoft/TypeScript#56948

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: a8ef1edcb31962708b548acb42186c1e29b3733b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ------- | ----- | | inngest | Patch |

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[jpwilliams]

Shipping, as the final release candidate is ready.