Use https for Maven repos

Author: joelittlejohn

pom.xml

@@ -476,11 +476,11 @@
     <repositories>
         <repository>
             <id>central</id>
-            <url>http://repo1.maven.org/maven2</url>
+            <url>https://repo1.maven.org/maven2</url>
         </repository>
         <repository>
             <id>gradle-workaround</id>
-            <url>http://repo.spring.io/plugins-release</url>
+            <url>https://repo.spring.io/plugins-release</url>
             <snapshots>
               <enabled>false</enabled>
             </snapshots>