update blog url (#16741)

## Description 

Describe the changes or additions included in this PR.

## Test Plan 

How did you test the new or updated feature?

---
If your changes are not user-facing and do not break anything, you can
skip the following section. Otherwise, please briefly describe what has
changed under the Release Notes section.

### Type of Change (Check all that apply)

- [ ] protocol change
- [ ] user-visible impact
- [ ] breaking change for a client SDKs
- [ ] breaking change for FNs (FN binary must upgrade)
- [ ] breaking change for validators or node operators (must upgrade
binaries)
- [ ] breaking change for on-chain data layout
- [ ] necessitate either a data wipe or data migration

### Release notes

apps/explorer/src/components/footer/footerLinks.tsx

@@ -15,7 +15,7 @@ function FooterIcon({ children }: { children: ReactNode }) {
 }
 
 export const footerLinks = [
-	{ title: 'Blog', href: 'https://medium.com/mysten-labs' },
+	{ title: 'Blog', href: 'https://mystenlabs.com/blog' },
 	{
 		title: 'Whitepaper',
 		href: 'https://github.com/MystenLabs/sui/blob/main/doc/paper/sui.pdf',