[19937] Update TLS unit test certificates (backport #4028)

[mergify]

This is an automatic backport of pull request #4028 done by Mergify.
Cherry-pick of 2a867e0 has failed:

On branch mergify/bp/2.11.x/pr-4028
Your branch is up to date with 'origin/2.11.x'.

You are currently cherry-picking commit 2a867e062.
  (fix conflicts and run "git cherry-pick --continue")
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Changes to be committed:
	modified:   .github/workflows/asan/asan_colcon.meta
	modified:   .github/workflows/config/default_ci.meta
	modified:   .github/workflows/config/nightly.meta
	modified:   test/unittest/transport/certs/README.md
	modified:   test/unittest/transport/certs/ca.crt
	modified:   test/unittest/transport/certs/ca.key
	modified:   test/unittest/transport/certs/fastdds.crt
	modified:   test/unittest/transport/certs/fastdds.csr
	modified:   test/unittest/transport/certs/fastdds.key

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   .github/workflows/config/tsan_colcon.meta

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[cferreiragonz]

@richiprosima please test this