Start building against Spring Framework 5.3.0.RC1 SNAPSHOTs

See gh-23170

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

@@ -1564,7 +1564,7 @@ bom {
 			]
 		}
 	}
-	library("Spring Framework", "5.3.0-M2") {
+	library("Spring Framework", "5.3.0-SNAPSHOT") {
 		group("org.springframework") {
 			imports = [
 				"spring-framework-bom"

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/SpringApplicationTests.java

@@ -1198,9 +1198,7 @@ class SpringApplicationTests {
 				.filter((invocation) -> invocation.getMethod().toString().contains("start(")).count();
 		long endCount = mockingDetails(startupStep).getInvocations().stream()
 				.filter((invocation) -> invocation.getMethod().toString().contains("end(")).count();
-		assertThat(startCount).isEqualTo(endCount + 1); // Will be same after
-														// spring-framework #25572 is
-														// fixed
+		assertThat(startCount).isEqualTo(endCount);
 	}
 
 	private <S extends AvailabilityState> ArgumentMatcher<ApplicationEvent> isAvailabilityChangeEventWithState(