Add ERC-4626 extensions

[hieronx]

Description

Links ERC-7540 and ERC-7575 (both finalized standards) in ERC-4626 page, describing the need for these standards and linking to the specification.

Related Issue

Addresses #14333

[netlify]

✅ Deploy Preview for ethereumorg ready!

Name	Link
🔨 Latest commit	9ee8c34
🔍 Latest deploy log	https://app.netlify.com/sites/ethereumorg/deploys/672dedde632fcc0008be9216
😎 Deploy Preview	https://deploy-preview-14334--ethereumorg.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	7 paths audited Performance: 45 (🔴 down 11 from production) Accessibility: 92 (no change from production) Best Practices: 89 (🔴 down 9 from production) SEO: 99 (no change from production) PWA: - View the detailed breakdown and full score reports

---

To edit notification comments on pull requests, go to your Netlify site configuration.