Adapt to PathMatchingResourcePatternResolver now matching root dir

See spring-projects/spring-framework#29163

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

@@ -92,9 +92,9 @@ class ClassLoaderFilesResourcePatternResolverTests {
 
 	@Test
 	void getResourcesShouldReturnResources(@TempDir File directory) throws Exception {
-		createFile(directory, "name.class");
+		File file = createFile(directory, "name.class");
 		Resource[] resources = this.resolver.getResources("file:" + directory.getAbsolutePath() + "/**");
-		assertThat(resources).isNotEmpty();
+		assertThat(resources).extracting(Resource::getFile).containsExactly(directory, file);
 	}
 
 	@Test
@@ -102,7 +102,7 @@ class ClassLoaderFilesResourcePatternResolverTests {
 		createFile(directory, "name.class");
 		this.files.addFile(directory.getName(), "name.class", new ClassLoaderFile(Kind.DELETED, null));
 		Resource[] resources = this.resolver.getResources("file:" + directory.getAbsolutePath() + "/**");
-		assertThat(resources).isEmpty();
+		assertThat(resources).extracting(Resource::getFile).containsExactly(directory);
 	}
 
 	@Test