Update Consul TLS secret for new CA in gstg

What

Update Consul TLS secret to use new CA secret created in !8157 (merged) in gstg.

Why

The CA is expiring in 2025-08-06 and needs to be renewed.

CR: gitlab-com/gl-infra/production#19980 (closed)

Issue: gitlab-com/gl-infra/production-engineering#25974 (closed)