Upgrade integration tests to Apache Maven 3.8.5

Closes gh-31260

Author: snicoll

spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/build.gradle

@@ -143,7 +143,7 @@ task xsdResources(type: Sync) {
 }
 
 prepareMavenBinaries {
-	versions "3.8.1", "3.6.3", "3.5.4"
+	versions "3.8.5", "3.6.3", "3.5.4"
 }
 
 artifacts {