Update an expired test certificate

What does this MR do and why?

This backports !155694 (merged) to 16-2-stable-ee to fix an expired TLS certificate in Workhorse tests: #467494.

Problem

The previous certificate that was used in tests got expired. As a result tests started failing with "tls: failed to verify certificate: x509: certificate has expired or is not yet valid: current time 2024-06-07T06:16:03Z is after 2024-06-07T04:31:24Z"

Solution

Reissue a certificate with an expiration date "Aug 24 09:26:29 2032 GMT"

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• This MR is backporting a bug fix, documentation update, or spec fix, previously merged in the default branch.
• The MR that fixed the bug on the default branch has been deployed to GitLab.com (not applicable for documentation or spec changes).
• This MR has a severity label assigned (if applicable).
• Set the milestone of the merge request to match the target backport branch version.
• This MR has been approved by a maintainer (only one approval is required).
• Ensure the e2e:package-and-test-ee job has either succeeded or been approved by a Software Engineer in Test.

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