Use https for maven repositories

build.gradle

@@ -1,6 +1,6 @@
 buildscript {
 	repositories {
-		maven { url "http://repo.springsource.org/plugins-release" }
+		maven { url "https://repo.spring.io/plugins-release" }
 	}
 	dependencies {
 		classpath("org.springframework.build.gradle:propdeps-plugin:0.0.7")
@@ -110,7 +110,7 @@ configure(allprojects) { project ->
 	}
 
 	repositories {
-		maven { url "http://repo.spring.io/libs-release" }
+		maven { url "https://repo.spring.io/libs-release" }
 	}
 
 	dependencies {