Expired SSL certificate on opennetlinux.org

[berendt]

On opennetlinux.org an expired SSL certificate is used. This already expired in October last year.

$ openssl s_client -connect opennetlinux.org:443
CONNECTED(00000005)
depth=2 O = Digital Signature Trust Co., CN = DST Root CA X3
verify return:1
depth=1 C = US, O = Let's Encrypt, CN = Let's Encrypt Authority X3
verify return:1
depth=0 CN = www.opennetlinux.org
verify error:num=10:certificate has expired
notAfter=Oct 11 23:31:08 2019 GMT
verify return:1
depth=0 CN = www.opennetlinux.org
notAfter=Oct 11 23:31:08 2019 GMT
verify return:1
---
Certificate chain
 0 s:/CN=www.opennetlinux.org
   i:/C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X3
 1 s:/C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X3
   i:/O=Digital Signature Trust Co./CN=DST Root CA X3
[...]