Fix camel-jackson-test to use jackson2-annotations-version for jackson-annotations

jackson-annotations 2.20.1 doesn't exist; use the correct property
jackson2-annotations-version (2.20) instead of jackson2-version.

Author: jbonofre

tests/features/camel-jackson/pom.xml

@@ -36,7 +36,7 @@
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-annotations</artifactId>
-            <version>${jackson2-version}</version>
+            <version>${jackson2-annotations-version}</version>
         </dependency>
     </dependencies>