docs: Update ios-swift quickstart docs

[NandanPrabhu]

Description

PR updates ios-swift quickstart mdx file to accommodate v4 the new major release of auth0.swift SDK

References

Testing

Checklist

• I've read and followed CONTRIBUTING.md.
• I've tested the site build for this change locally.
• I've made appropriate docs updates for any code or config changes.
• I've coordinated with the Product Docs and/or Docs Management team about non-trivial changes.

[github-actions]

Summary

Status	Count
🔍 Total	2
✅ Successful	0
⏳ Timeouts	0
🔀 Redirected	0
👻 Excluded	2
❓ Unknown	0
🚫 Errors	0
⛔ Unsupported	0
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