Fix several Sonar warnings

Signed-off-by: Michael Edgar <michael@xlate.io>

Author: MikeEdgar

core/src/main/java/io/smallrye/openapi/runtime/io/JsonIO.java

@@ -65,7 +65,7 @@ default void mapObject(BaseModel<?> object, OB nodeBuilder) {
     @SuppressWarnings("unchecked")
     public static <V, A extends V, O extends V, AB, OB> JsonIO<V, A, O, AB, OB> newInstance(
             SmallRyeOpenAPI.JsonProvider jsonProvider, OpenApiConfig config) {
-        return (JsonIO<V, A, O, AB, OB>) newInstanceRaw(jsonProvider, config);
+        return newInstanceRaw(jsonProvider, config);
     }
 
     @SuppressWarnings("rawtypes")

core/src/test/java/io/smallrye/openapi/runtime/io/Jackson2JsonIOTest.java

@@ -24,6 +24,7 @@ static boolean jackson2Present() {
         }
     }
 
+    @Override
     @BeforeEach
     void setup(TestInfo testInfo) {
         super.setup(testInfo);

core/src/test/java/io/smallrye/openapi/runtime/io/Jackson3JsonIOTest.java

@@ -23,6 +23,7 @@ static boolean jackson3Present() {
         }
     }
 
+    @Override
     @BeforeEach
     void setup(TestInfo testInfo) {
         super.setup(testInfo);