Fixing DOH leak by applying a patch from Firefox 132

As of now (and probably sine the start), when we use a proxy with DoH enabled, the extension proxyDNS setting will not be respected. This means that DNS requests will be leaking.

There's an upstream patch fixing this from Firefox 132.

• related issue: https://bugzilla.mozilla.org/show_bug.cgi?id=1910593

Would it be possible to apply this patch to MB as well without waiting for the next ESR?