pom: update jacoco plugin to java21 capable

in prep to java21

Acked-by: Lea Morschel
Target: master

Author: kofemann

pom.xml

@@ -96,7 +96,7 @@
         <plugin>
             <groupId>org.jacoco</groupId>
             <artifactId>jacoco-maven-plugin</artifactId>
-            <version>0.8.8</version>
+            <version>0.8.12</version>
             <executions>
                 <!--
                     Prepares the property pointing to the JaCoCo runtime agent which