Update outdated test certificates
What does this MR do?
This updates the outdated test certificates because they expired 2026-05-14T16:26:21Z.
Updated as per test/testdata/mutualtls/valid/README.md.
TODO
- Feature flag
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Added feature flag:
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This feature does not require a feature flag
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- I added the
Changelogtrailer to the commits that need to be included in the changelog (e.g.Changelog: added) - I added unit tests or they are not required
- I added acceptance tests or they are not required
- I added documentation (or it's not required)
- I followed code review guidelines
- I followed Go Style guidelines