Remove dependency on org.jetbrains:annotations through test-harness (#2683)

It has been removed from the Jenkins plugins parent pom a while ago, and
shouldn't be transitive.

Author: Vlatombe

test-harness/pom.xml

@@ -49,6 +49,12 @@
       <groupId>com.vladsch.flexmark</groupId>
       <artifactId>flexmark-all</artifactId>
       <version>0.64.8</version>
+      <exclusions>
+        <exclusion>
+          <groupId>org.jetbrains</groupId>
+          <artifactId>annotations</artifactId>
+        </exclusion>
+      </exclusions>
     </dependency>
     <dependency>
       <groupId>io.jenkins</groupId>