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What type of PR is this?
/kind feature
What this PR does / why we need it:
Update to go 1.21. Kubernetes releases are at 1.21 and many projects are slowly updating their mains to reflect 1.22.
Which issue(s) this PR fixes:
Fixes #
Special notes for your reviewer:
I think we should upgrade to 1.22 soon as 1.30 is set to 1.22 but I think a single version bump is good for a PR.
Does this PR introduce a user-facing change?
Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.: