Start building against Spring Framework 6.0.0-M3 snapshots

See gh-29957

spring-boot-project/spring-boot-dependencies/build.gradle

@@ -1334,7 +1334,7 @@ bom {
 			]
 		}
 	}
-	library("Spring Framework", "6.0.0-M2") {
+	library("Spring Framework", "6.0.0-SNAPSHOT") {
 		group("org.springframework") {
 			imports = [
 				"spring-framework-bom"

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/bind/BindableTests.java

@@ -146,7 +146,7 @@ class BindableTests {
 		Bindable<String> bindable = Bindable.of(String.class).withExistingValue("foo").withAnnotations(annotation);
 		assertThat(bindable.toString())
 				.contains("type = java.lang.String, value = 'provided', annotations = array<Annotation>["
-						+ "@org.springframework.boot.context.properties.bind.BindableTests$TestAnnotation()]");
+						+ "@org.springframework.boot.context.properties.bind.BindableTests.TestAnnotation()]");
 	}
 
 	@Test