update version

Signed-off-by: ale <ale@manalejandro.com>

README.md

@@ -2,7 +2,7 @@
 
 ### del griego `archivo`
 
-### Proof of Concept with [SpringBoot 2.6.1](https://start.spring.io/), [ElasticSearch](https://www.elastic.co/) and [Apache Tika](https://tika.apache.org/)
+### Proof of Concept with [SpringBoot 4.0.0](https://start.spring.io/), [ElasticSearch](https://www.elastic.co/) and [Apache Tika](https://tika.apache.org/)
 
 ## Docker image