Update camel.version to v4.21.0

Author: renovate[bot]

pom.xml

@@ -44,7 +44,7 @@
         <maven.compiler.release>${java.version}</maven.compiler.release>
 
         <!-- Frameworks -->
-        <camel.version>4.8.0</camel.version>
+        <camel.version>4.21.0</camel.version>
         <spring.boot.version>3.3.4</spring.boot.version>
         <tika.version>3.0.0</tika.version>