Remove invalid checksum policy setting

This might be a copy/paste error as the checksum policy is used for
deploying and our integration tests do not do that.

Closes spring-projectsgh-41651

Author: snicoll

spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/intTest/projects/settings.xml

@@ -17,7 +17,6 @@
 					<snapshots>
 						<enabled>true</enabled>
 					</snapshots>
-					<checksumPolicy>ignore</checksumPolicy>
 				</repository>
 				<repository>
 					<id>spring-milestones</id>
@@ -43,7 +42,6 @@
 					<snapshots>
 						<enabled>true</enabled>
 					</snapshots>
-					<checksumPolicy>ignore</checksumPolicy>
 				</pluginRepository>
 				<pluginRepository>
 					<id>spring-milestones</id>