fix(@blitzjs/generator): make Next.js version pinning to 13.4.5

[exKAZUu]

Closes: #4149

This PR ensures that Next.js remains at version 13.3.4. Although using ~13.3.4 is an option, I recommend pinning it to 13.3.4 to prevent potential compatibility issues.

What are the changes and their implications?

Bug Checklist

• Changeset added (run pnpm changeset in the root directory)
• Integration test added (see test docs if needed)

Feature Checklist

• Changeset added (run pnpm changeset in the root directory)
• Integration test added (see test docs if needed)
• Documentation added/updated (submit PR to blitzjs.com repo main branch)

[changeset-bot]

🦋 Changeset detected

Latest commit: dfdd9c1

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

This PR includes changesets to release 8 packages

Name	Type
@blitzjs/generator	Patch
blitz	Patch
@blitzjs/codemod	Patch
next-blitz-auth	Patch
@blitzjs/auth	Patch
@blitzjs/next	Patch
@blitzjs/rpc	Patch
@blitzjs/config	Patch

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[siddhsuresh]

@exKAZUu can you upgrade the next version to latest 13.4.5?

[exKAZUu]

@siddhsuresh Okay, I've done.