Remove unused jackson.version property from metrics-parent (#3642)

Author: joschi

pom.xml

@@ -56,7 +56,6 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 
-        <jackson.version>2.12.3</jackson.version>
         <jetty9.version>9.4.53.v20231009</jetty9.version>
         <jetty10.version>10.0.17</jetty10.version>
         <jetty11.version>11.0.17</jetty11.version>