Code cleanup

* Remove redundant throws clause from CachingHealthCheck#check
* Suppress unused method warning in StandardExceptionMappersTest

Closes #549
Closes #550

src/main/java/org/kiwiproject/dropwizard/util/health/CachingHealthCheck.java

@@ -139,7 +139,7 @@ public static CachingHealthCheck register(HealthCheckRegistry registry,
      * Otherwise, return the last Result.
      */
     @Override
-    protected Result check() throws Exception {
+    protected Result check() {
         var nowEpochMillis = kiwiEnvironment.currentTimeMillis();
         var lastResult = lastResultReference.get();
         var millisSinceLastCheck = nowEpochMillis - lastResult.epochMillis();

src/test/java/org/kiwiproject/dropwizard/util/exception/StandardExceptionMappersTest.java

@@ -131,6 +131,7 @@ public static class SupportedCustomServerFactory implements ServerFactory {
         boolean registerDefaultExceptionMappersCalled;
         boolean argumentHadCorrectValue;
 
+        @SuppressWarnings("unused")  // this is called via reflection
         public void setRegisterDefaultExceptionMappers(Boolean registerDefaultExceptionMappers) {
             registerDefaultExceptionMappersCalled = true;
             argumentHadCorrectValue = nonNull(registerDefaultExceptionMappers) && !registerDefaultExceptionMappers;