Upgrade to Maven Enforcer Plugin 3.0.0-M3

Closes gh-19124

Author: snicoll

spring-boot-project/spring-boot-dependencies/pom.xml

@@ -209,7 +209,7 @@
 		<maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
 		<maven-dependency-plugin.version>3.1.1</maven-dependency-plugin.version>
 		<maven-deploy-plugin.version>2.8.2</maven-deploy-plugin.version>
-		<maven-enforcer-plugin.version>3.0.0-M2</maven-enforcer-plugin.version>
+		<maven-enforcer-plugin.version>3.0.0-M3</maven-enforcer-plugin.version>
 		<maven-failsafe-plugin.version>2.22.2</maven-failsafe-plugin.version>
 		<maven-install-plugin.version>2.5.2</maven-install-plugin.version>
 		<maven-invoker-plugin.version>3.1.0</maven-invoker-plugin.version>