Fix prom check after reverting back to LE certs
In !682 (merged) we reverted back to LE certs, however the prom test now fails due to the unverified cert.
from https://open.greenhost.net/stackspin/stackspin/-/jobs/147208:
E urllib3.exceptions.MaxRetryError: HTTPSConnectionPool(host='prometheus.main.ci.stackspin.net', port=443): Max retries exceeded with url: /api/v1/alerts (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1129)')))
Edited by Varac