The certificate for nitter.net has expired.
The public key certificate for nitter.net has expired.
So, please renew the certificate.

```sh
❯ openssl s_client -connect nitter.net:443  2> /dev/null | openssl x509 -noout -subject -dates
subject=CN = nitter.net
notBefore=Jan 30 23:35:03 2023 GMT
notAfter=Apr 30 23:35:02 2023 GMT
```