chore(deps): update registry.access.redhat.com/ubi9/go-toolset docker tag to v1.21

[red-hat-konflux]

This PR contains the following updates:

Package	Type	Update	Change
registry.access.redhat.com/ubi9/go-toolset	stage	minor	1.20 -> 1.21

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

Hi @red-hat-konflux[bot]. Thanks for your PR.

I'm waiting for a openshift 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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[danielerez]

Handled by #260