Upgrade to Maven Assembly Plugin 3.1.1

Closes gh-15612

Author: snicoll

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

@@ -191,7 +191,7 @@
 		<exec-maven-plugin.version>1.5.0</exec-maven-plugin.version>
 		<git-commit-id-plugin.version>2.2.5</git-commit-id-plugin.version>
 		<maven-antrun-plugin.version>1.8</maven-antrun-plugin.version>
-		<maven-assembly-plugin.version>3.1.0</maven-assembly-plugin.version>
+		<maven-assembly-plugin.version>3.1.1</maven-assembly-plugin.version>
 		<maven-clean-plugin.version>3.0.0</maven-clean-plugin.version>
 		<maven-compiler-plugin.version>3.7.0</maven-compiler-plugin.version>
 		<maven-dependency-plugin.version>3.0.2</maven-dependency-plugin.version>