chore: update Quarkus platform version to 3.21.1

[github-actions[bot]]

chore: update Quarkus platform version to 3.21.1

[knative-prow[bot]]

Hi @github-actions[bot]. Thanks for your PR.

I'm waiting for a knative member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[matejvasek]

/approve /lgtm

[knative-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: github-actions[bot], matejvasek

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