Improve action optional param type

[chungweileong94]

Why?

Currently, if you try to pass an action without input into <form> action prop, it will throw type error below

After the fix

Empty input

const action = serverAct.action(async () => Promise.resolve('bar'));
//     ^?  () => Promise<string>

Non-optional input

const action = serverAct.input(z.string()).action(async () => Promise.resolve('bar'));
//     ^?  (input: string) => Promise<string>

Optional input

const action = serverAct.input(z.string().optional()).action(async () => Promise.resolve('bar'));
//     ^?  (input?: string | undefined) => Promise<string>

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🦋 Changeset detected

Latest commit: b1cbc4a3ba62d3613d8ada41794c900676e9636b

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

This PR includes changesets to release 1 package

| Name | Type | | ---------- | ----- | | server-act | Patch |

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