E-Mail from buypass informing about changes, dehydrated stopped working immediately

Yesterday, I received an email from buypass informing about changes to their certificates and that all buypass certs will be revoked as of 01-08-2024.
They recommend renewing all the certs manually to prevent outage.

I tried doing that with dehydrated but that doesn't work anymore:

```shell
+ Responding to challenge for **** authorization...
+ ERROR: An error occurred while sending post-request to https://api.buypass.com/acme-v02/authz/*****/1 (Status 400)

Details:
HTTP/1.1 400 Bad Request
Cache-Control: no-store
Content-Language: en
Content-Length: 194
Content-Type: application/problem+json
Date: Thu, 04 Jan 2024 10:28:53 GMT
Mdc-Correlationid: *****
Replay-Nonce: *****
Vary: Accept-Encoding
X-Buypass-Internal-Error-Detail-Code: MALFORMED_BAD_REQUEST
Strict-Transport-Security: max-age=63072000

{"type":"urn:ietf:params:acme:error:malformed","detail":"Unable to process challenge, authorization is not pending","code":400,"message":"MALFORMED_BAD_REQUEST","details":"HTTP 400 Bad Request"}

EXPECTED value GOT EOF
```

Can you please look into this until 01-08-2024.
I use ocsp stapling with buypass chain-of-trust and I really don't want to switch to letsencrypt because that is a little bit harder to setup.

Thanks :)