vendor/guzzlehttp/promises conflicts but shouldn't be there to begin with

[Mark-H]

https://secure.helpscout.net/conversation/2516136385/39209?folderId=46284

Fatal error: Declaration of GuzzleHttp\Promise\Promise::then(?callable $onFulfilled = null, ?callable $onRejected = null) must be compatible with GuzzleHttp\Promise\PromiseInterface::then(?callable $onFulfilled = null, ?callable $onRejected = null): GuzzleHttp\Promise\PromiseInterface in /core/components/bigbrother/vendor/guzzlehttp/promises/src/Promise.php on line 31

[muzzwood]

Hmm it looks like google/auth is still requiring it