Update Java Worker Version to 2.8.0

pom.xml

@@ -2,7 +2,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.microsoft.azure.functions</groupId>
   <artifactId>azure-functions-java-worker</artifactId>
-  <version>2.7.0</version>
+  <version>2.8.0</version>
   <packaging>jar</packaging>
   <parent>
     <groupId>com.microsoft.maven</groupId>
@@ -294,4 +294,4 @@
       </plugin>
     </plugins>
   </build>
-</project>
+</project>