Switch to the Apache Tomcat EL implementation by default

Previously we used org.glassfish:jakarta.el as our default EL
implementation. Since adopting it we have learned that it can be
significantly slower than Apache Tomcat's EL implementation in some
scenarios. This commit switches to using
org.apache.tomcat.embed:tomcat-embed-el by default instead of the
Glassfish implementation.

Closes gh-24744

spring-boot-project/spring-boot-starters/spring-boot-starter-validation/build.gradle

@@ -6,6 +6,6 @@ description = "Starter for using Java Bean Validation with Hibernate Validator"
 
 dependencies {
 	api(project(":spring-boot-project:spring-boot-starters:spring-boot-starter"))
-	api("org.glassfish:jakarta.el")
+	api("org.apache.tomcat.embed:tomcat-embed-el")
 	api("org.hibernate.validator:hibernate-validator")
 }