[BUG] [v1.0.x] Update `ca-certificates` package

[przemyslavic]

Describe the bug v1.0.6 deployment on Ubuntu fails with the following error:

Connection failure, reason: [ WARNING: apt does not have a stable CLI interface. Use with caution in scripts.
E: The repository 'https://packages.grafana.com/oss/deb stable Release' does not have a Release file.]

More in detail after debugging:

Ign:4 https://packages.grafana.com/oss/deb stable InRelease
Err:5 https://packages.grafana.com/oss/deb stable Release
  Certificate verification failed: The certificate is NOT trusted. The certificate chain uses expired certificate.  Could not handshake: Error in the certificate verification. [IP: 199.232.26.217 443]

We have to update the ca-certificates package on the repository host before proceeding with the download-requirements script.

How to reproduce Steps to reproduce the behavior:

1. Try to deploy any v1.0.6 Ubuntu cluster.

Expected behavior The cluster should be deployed without any issues.

Config files If applicable, add config files to help explain your problem.

Environment

• Cloud provider: [all]
• OS: [Ubuntu 18.04]

epicli version: v1.0.6

Additional context Add any other context about the problem here.

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DoD checklist

• Changelog
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