Bromite: Certificate for fdroid.bromite.org is expired

Describe the bug

It's impossible to interact with Bromite F-Droid repository due to certificate expiration. Simple GET-request via curl : curl https://fdroid.bromite.org/fdroid/repo reports the following error:

curl: (60) SSL certificate problem: certificate has expired
More details here: https://curl.haxx.se/docs/sslcerts.html

curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.

Steps to reproduce the bug

1. Open QR-code from https://www.bromite.org/fdroid in f-droid client
2. Enable Bromite repository
3. Update repositories

Alternatively, use curl to perform GET-request to https://fdroid.bromite.org/fdroid/repo:

1. curl https://fdroid.bromite.org/fdroid/repo

Screenshots