fix system internal encryption

[dprotaso]

This uses the new SANs and certificate.

Fixes: https://github.com/knative-extensions/net-contour/issues/703

Release Note

Fixes system-internal-encryption by using the updated activator and workload subject alternate names

[knative-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso

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[dprotaso]

/assign @ReToCode

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.96%. Comparing base (b1718e4) to head (c318bab).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1110 +/- ## ========================================== + Coverage 93.92% 93.96% +0.03% ========================================== Files 11 11 Lines 708 712 +4 ========================================== + Hits 665 669 +4 Misses 22 22 Partials 21 21 ```

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[izabelacg]

/lgtm