Change bintray download url from HTTP to HTTPS

Change-Id: Ib17394d65bf724ae3437ca54661a35abf76d4d52
(cherry picked from commit ff7568b)
Reviewed-on: https://git.eclipse.org/r/158334
Tested-by: CI Bot
Reviewed-by: Andi Bur <andi.bur@gmail.com>

org.eclipse.scout.rt/pom.xml

@@ -794,7 +794,7 @@
       </snapshots>
       <id>bintray-bsi-business-systems-integration-ag-scout-eclipse-org</id>
       <name>bintray</name>
-      <url>http://dl.bintray.com/bsi-business-systems-integration-ag/scout-eclipse-org</url>
+      <url>https://dl.bintray.com/bsi-business-systems-integration-ag/scout-eclipse-org</url>
     </repository>
   </repositories>
 
@@ -820,7 +820,7 @@
       </snapshots>
       <id>bintray-bsi-business-systems-integration-ag-scout-eclipse-org</id>
       <name>bintray-plugins</name>
-      <url>http://dl.bintray.com/bsi-business-systems-integration-ag/scout-eclipse-org</url>
+      <url>https://dl.bintray.com/bsi-business-systems-integration-ag/scout-eclipse-org</url>
     </pluginRepository>
   </pluginRepositories>