Polish "Upgrade to Apache Camel 4.12.0"

See gh-1820

Author: snicoll

start-site/src/main/resources/application.yml

@@ -836,14 +836,14 @@ initializr:
               href: https://rsocket.io/
         - name: Apache Camel
           id: camel
-          compatibilityRange: "[3.3.0,3.5.0-M1)"
+          compatibilityRange: "[3.3.0,3.6.0-M1)"
           mappings:
             - compatibilityRange: "[3.3.0,3.4.0-M1)"
               version: 4.8.6
             - compatibilityRange: "[3.4.0,3.5.0-M1)"
               version: 4.11.0
             - compatibilityRange: "[3.5.0,3.6.0-M1)"
-              version: 4.12.0              
+              version: 4.12.0
           description: Apache Camel is an open source integration framework that empowers you to quickly and easily integrate various systems consuming or producing data.
           groupId: org.apache.camel.springboot
           artifactId: camel-spring-boot-starter