docs: Fix typo

Author: amannn

docs/src/pages/blog/next-intl-4-0.mdx

@@ -325,7 +325,7 @@ A special thank you goes to <PartnerContentLink href="https://crowdin.com/">Crow
 
 —Jan
 
-(this post has been updated from an initial announcement for the 3.0 release candidate)
+(this post has been updated from an initial announcement for the 4.0 release candidate)
 
 PS: Have you heard that [learn.next-intl.dev](https://learn.next-intl.dev) is coming?