Fix jApiCmp CI check (#6577)

Author: trask

conventions/src/main/kotlin/otel.japicmp-conventions.gradle.kts

@@ -98,9 +98,9 @@ if (project.findProperty("otel.stable") == "true") {
             ?: file("$rootDir/docs/apidiffs/current_vs_$baseVersionString/${base.archivesName.get()}.txt")
         )
       }
-      // have the check task depend on the api comparison task, to make it more likely it will get used.
-      named("check") {
-        dependsOn(jApiCmp)
+      // have the jApiCmp task run every time the jar task is run, to make it more likely it will get used.
+      named("jar") {
+        finalizedBy(jApiCmp)
       }
     }
   }