Steps to reproduce:

1. Start a zabbix/zabbix-server-pgsql:alpine-5.4.4 docker container with it's related services
2. In the web GUI, define a host
3. Create a web scenario pointing on a valid Let's Encrypted domain
4. In Authentication, check both "SSL verify *" options

Result:
Zabbix problems will claim:
> SSL peer certificate or SSH remote key was not OK: SSL certificate problem: certificate has expired

Expected:
No problem with the web scenario

Suspected:
The root certificate expiration mentioned here:
https://letsencrypt.org/docs/dst-root-ca-x3-expiration-september-2021/
Not sure how to check which openssl version we are using here.
Seems like it's < 1.1.0