remove deprecations and fixed some compiler warnings

scm-webapp/src/test/java/sonia/scm/net/ahc/DefaultAdvancedHttpResponseTest.java

@@ -103,6 +103,7 @@ public class DefaultAdvancedHttpResponseTest
    * @throws IOException
    */
   @Test
+  @SuppressWarnings("unchecked")
   public void testContentAsByteSourceWithFailedRequest() throws IOException
   {
     ByteArrayInputStream bais =

scm-webapp/src/test/java/sonia/scm/net/ahc/JsonContentTransformerTest.java

@@ -103,6 +103,7 @@ public class JsonContentTransformerTest
    *
    * @throws IOException
    */
+  @SuppressWarnings("unchecked")
   @Test(expected = ContentTransformerException.class)
   public void testUnmarshallIOException() throws IOException
   {

scm-webapp/src/test/java/sonia/scm/net/ahc/XmlContentTransformerTest.java

@@ -63,6 +63,7 @@ public class XmlContentTransformerTest {
     assertEquals("test", to.value);
   }
   
+  @SuppressWarnings("unchecked")
   @Test(expected = ContentTransformerException.class)
   public void testUnmarshallIOException() throws IOException{
     ByteSource bs = mock(ByteSource.class);