Polish pom.xml

Aplly consistent formatting, drop JDK 8 support and cleanup repo
locations to use spring.io.

spring-boot-cli-grape/pom.xml

@@ -71,7 +71,7 @@
 			<groupId>org.eclipse.aether</groupId>
 			<artifactId>aether-util</artifactId>
 		</dependency>
-		<!--  Test -->
+		<!-- Test -->
 		<dependency>
 			<groupId>junit</groupId>
 			<artifactId>junit</artifactId>
@@ -134,7 +134,8 @@
 		</plugins>
 		<pluginManagement>
 			<plugins>
-				<!--This plugin's configuration is used to store Eclipse m2e settings only. It has no influence on the Maven build itself.-->
+				<!--This plugin's configuration is used to store Eclipse m2e settings
+					only. It has no influence on the Maven build itself. -->
 				<plugin>
 					<groupId>org.eclipse.m2e</groupId>
 					<artifactId>lifecycle-mapping</artifactId>
@@ -152,7 +153,7 @@
 										</goals>
 									</pluginExecutionFilter>
 									<action>
-										<execute/>
+										<execute />
 									</action>
 								</pluginExecution>
 							</pluginExecutions>