Remove unnecessary throws declaration in tests

See gh-26441

spring-boot-project/spring-boot-tools/spring-boot-jarmode-layertools/src/test/java/org/springframework/boot/jarmode/layertools/ExtractCommandTests.java

@@ -75,7 +75,7 @@ class ExtractCommandTests {
 	}
 
 	@Test
-	void runExtractsLayers() throws Exception {
+	void runExtractsLayers() {
 		given(this.context.getArchiveFile()).willReturn(this.jarFile);
 		given(this.context.getWorkingDir()).willReturn(this.extract);
 		this.command.run(Collections.emptyMap(), Collections.emptyList());

spring-boot-project/spring-boot-tools/spring-boot-jarmode-layertools/src/test/java/org/springframework/boot/jarmode/layertools/IndexedLayersTests.java

@@ -51,7 +51,7 @@ class IndexedLayersTests {
 	}
 
 	@Test
-	void createWhenIndexFileIsMalformedThrowsException() throws Exception {
+	void createWhenIndexFileIsMalformedThrowsException() {
 		assertThatIllegalStateException().isThrownBy(() -> new IndexedLayers("test"))
 				.withMessage("Layer index file is malformed");
 	}