chore: bump go version to 1.21

[harishsurf]

No description provided.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: bcaton85, harishsurf
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[harishsurf]

/cherry-pick redhat-3.11

[openshift-cherrypick-robot]

@harishsurf: #131 failed to apply on top of branch "redhat-3.11":

Applying: chore: bump go version to 1.21
Using index info to reconstruct a base tree...
M	go.mod
M	go.sum
Falling back to patching base and 3-way merge...
Auto-merging go.sum
CONFLICT (content): Merge conflict in go.sum
Auto-merging go.mod
CONFLICT (content): Merge conflict in go.mod
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 chore: bump go version to 1.21
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick redhat-3.11

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[harishsurf]

/cherry-pick redhat-3.12

[openshift-cherrypick-robot]

@harishsurf: new pull request created: #132

In response to this:

/cherry-pick redhat-3.12

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.