merge-request.sh: Use https url for bugzilla

With the http url, the script fails with:

Connection lost/failed: 411 Client Error: Length Required

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@303685 91177308-0d34-0410-b5e6-96231b3b80d8

utils/release/merge-request.sh

@@ -23,7 +23,7 @@ bugzilla_component="new bugs"
 bugzilla_assigned_to=""
 bugzilla_user=""
 bugzilla_version=""
-bugzilla_url="http://bugs.llvm.org/xmlrpc.cgi"
+bugzilla_url="https://bugs.llvm.org/xmlrpc.cgi"
 
 function usage() {
   echo "usage: `basename $0` -user EMAIL -stable-version X.Y -r NUM"