In default.target, access p2 repository over HTTPS

Change-Id: I5c3d9cc36e88c365228f1f63acdffd8960bc241b
Signed-off-by: Mykola Nikishov <mn@mn.com.ua>
diff --git a/org.eclipse.equinox.p2.releng/default.target b/org.eclipse.equinox.p2.releng/default.target
index e695b0a..2bc4e7a 100644
--- a/org.eclipse.equinox.p2.releng/default.target
+++ b/org.eclipse.equinox.p2.releng/default.target
@@ -4,7 +4,7 @@
 <unit id="org.eclipse.platform.sdk" version="0.0.0"/>
 <unit id="org.eclipse.core.tests.harness" version="0.0.0"/>
 <unit id="org.eclipse.test.feature.group" version="0.0.0"/>
-<repository location="http://download.eclipse.org/eclipse/updates/4.12-I-builds"/>
+<repository location="https://download.eclipse.org/eclipse/updates/4.12-I-builds"/>
 </location>
 </locations>
 <targetJRE path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>