Upgrade to Maven Source Plugin 3.1.0

Closes gh-16922

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

@@ -231,7 +231,7 @@
 		<maven-resources-plugin.version>3.1.0</maven-resources-plugin.version>
 		<maven-shade-plugin.version>3.2.1</maven-shade-plugin.version>
 		<maven-site-plugin.version>3.7.1</maven-site-plugin.version>
-		<maven-source-plugin.version>3.0.1</maven-source-plugin.version>
+		<maven-source-plugin.version>3.1.0</maven-source-plugin.version>
 		<maven-surefire-plugin.version>2.22.2</maven-surefire-plugin.version>
 		<maven-war-plugin.version>3.2.2</maven-war-plugin.version>
 		<versions-maven-plugin.version>2.7</versions-maven-plugin.version>