Update build and setup configuration to use HTTPS

See gh-16106

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

@@ -17,7 +17,7 @@
 	<licenses>
 		<license>
 			<name>Apache License, Version 2.0</name>
-			<url>http://www.apache.org/licenses/LICENSE-2.0</url>
+			<url>https://www.apache.org/licenses/LICENSE-2.0</url>
 		</license>
 	</licenses>
 	<scm>
@@ -28,7 +28,7 @@
 			<name>Pivotal</name>
 			<email>info@pivotal.io</email>
 			<organization>Pivotal Software, Inc.</organization>
-			<organizationUrl>http://www.spring.io</organizationUrl>
+			<organizationUrl>https://www.spring.io</organizationUrl>
 		</developer>
 	</developers>
 	<properties>

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

@@ -32,7 +32,7 @@
 		<spring-doc-resources.version>0.1.0.RELEASE</spring-doc-resources.version>
 	</properties>
 	<scm>
-		<url>http://github.com/spring-projects/spring-boot</url>
+		<url>https://github.com/spring-projects/spring-boot</url>
 		<connection>scm:git:git://github.com/spring-projects/spring-boot.git</connection>
 		<developerConnection>scm:git:ssh://git@github.com/spring-projects/spring-boot.git</developerConnection>
 	</scm>

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/build.gradle

@@ -46,7 +46,7 @@ javadoc {
 		author()
 		stylesheetFile = file('src/main/javadoc/spring-javadoc.css')
 		links = [
-			'http://docs.oracle.com/javase/8/docs/api/',
+			'https://docs.oracle.com/javase/8/docs/api/',
 			'https://docs.gradle.org/current/javadoc/'
 		]
 	}