Remove redundant throws declarations from internal APIs

Closes gh-31176

spring-boot-project/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/autoconfigure/OptionalLiveReloadServerTests.java

@@ -33,7 +33,7 @@ import static org.mockito.Mockito.never;
 class OptionalLiveReloadServerTests {
 
 	@Test
-	void nullServer() throws Exception {
+	void nullServer() {
 		OptionalLiveReloadServer server = new OptionalLiveReloadServer(null);
 		server.startServer();
 		server.triggerReload();

spring-boot-project/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/restart/RestarterTests.java

@@ -79,7 +79,7 @@ class RestarterTests {
 	}
 
 	@Test
-	void testRestart(CapturedOutput output) throws Exception {
+	void testRestart(CapturedOutput output) {
 		Restarter.clearInstance();
 		Thread thread = new Thread(SampleApplication::main);
 		thread.start();