MON-3861: Bump go tools 1.21

[simonpasquier]

/lgtm

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: marioferh, simonpasquier

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[openshift-ci-robot]

@marioferh: This pull request references MON-3861 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the task to target the "4.16.0" version, but no target version was set.

In response to [this](https://github.com/openshift/cluster-monitoring-operator/pull/2348): > Instructions for interacting with me using PR comments are available [here](https://prow.ci.openshift.org/command-help?repo=openshift%2Fcluster-monitoring-operator). If you have questions or suggestions related to my behavior, please file an issue against the [openshift-eng/jira-lifecycle-plugin](https://github.com/openshift-eng/jira-lifecycle-plugin/issues/new) repository.

[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD a9211caa4934ec58f6036d134eed488d33cc82f6 and 2 for PR HEAD 3951e31615b5cb56a2e6caec846e7d7b150a1741 in total

[openshift-ci[bot]]

@marioferh: all tests passed!

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[jan--f]

/label acknowledge-critical-fixes-only /label docs-approved

[openshift-bot]

[ART PR BUILD NOTIFIER]

This PR has been included in build cluster-monitoring-operator-container-v4.17.0-202405151441.p0.g40bdb02.assembly.stream.el9 for distgit cluster-monitoring-operator. All builds following this will include this PR.