Make private

Co-authored-by: Alex Ford <alexrford@users.noreply.github.com>

Author: maikypedia

ruby/ql/lib/codeql/ruby/frameworks/Ldap.qll

@@ -87,7 +87,7 @@ module NetLdap {
 
   /** A call considered as a LDAP bind. */
   private class NetLdapBind extends LdapBind::Range, DataFlow::CallNode {
-    NetLdapConnection l;
+    private NetLdapConnection l;
 
     NetLdapBind() { this = l.getAMethodCall("bind") }