Start building against Spring Framework 5.3.6 snapshots

See gh-25909

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

@@ -1565,7 +1565,7 @@ bom {
 			]
 		}
 	}
-	library("Spring Framework", "5.3.5") {
+	library("Spring Framework", "5.3.6-SNAPSHOT") {
 		group("org.springframework") {
 			imports = [
 				"spring-framework-bom"

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/servlet/support/ErrorPageFilterTests.java

@@ -399,7 +399,7 @@ class ErrorPageFilterTests {
 		assertThat(((HttpServletResponseWrapper) this.chain.getResponse()).getStatus()).isEqualTo(500);
 		assertThat(this.request.getAttribute(RequestDispatcher.ERROR_STATUS_CODE)).isEqualTo(500);
 		assertThat(this.request.getAttribute(RequestDispatcher.ERROR_MESSAGE))
-				.isEqualTo("Required string parameter 'test' is not present");
+				.isEqualTo("Required request parameter 'test' for method parameter type string is not present");
 		Map<String, Object> requestAttributes = getAttributesForDispatch("/500");
 		assertThat(requestAttributes.get(RequestDispatcher.ERROR_EXCEPTION_TYPE))
 				.isEqualTo(MissingServletRequestParameterException.class);