Updating gwc pom to depend on proper gt-coverage module (Needed for ImageWorker)

Author: dromagnoli

geowebcache/core/pom.xml

@@ -21,7 +21,7 @@
     </dependency>
     <dependency>
       <groupId>org.geotools</groupId>
-      <artifactId>gt-coverage-api</artifactId>
+      <artifactId>gt-coverage</artifactId>
     </dependency>
     <dependency>
       <groupId>org.apache.commons</groupId>