Update ct/globaleaks.sh using apt-get upgrade in place of apt-get install globaleaks

Co-authored-by: Slaviša Arežina <58952836+tremor021@users.noreply.github.com>

ct/globaleaks.sh

@@ -34,7 +34,7 @@ function update_script() {
 
     $STD sh -c 'echo "deb [signed-by=/etc/apt/trusted.gpg.d/globaleaks.gpg] http://deb.globaleaks.org $(lsb_release -sc) main" > /etc/apt/sources.list.d/globaleaks.list'
     $STD apt-get update
-    $STD apt-get -y install globaleaks
+    $STD apt-get -y upgrade
 
     msg_ok "Updated $APP LXC"
 }