Upgrade stolostron thanos build image to go1.21

[subbarao-meduri]

No description provided.

[subbarao-meduri]

/assign @saswatamcode

[saswatamcode]

/lgtm

[openshift-ci-robot]

[REHEARSALNOTIFIER]
@subbarao-meduri: the pj-rehearse plugin accommodates running rehearsal tests for the changes in this PR. Expand 'Interacting with pj-rehearse' for usage details. The following rehearsable tests have been affected by this change:

Test name	Repo	Type	Reason
pull-ci-stolostron-thanos-release-2.11-e2e-kind	stolostron/thanos	presubmit	Ci-operator config changed
pull-ci-stolostron-thanos-release-2.11-images	stolostron/thanos	presubmit	Ci-operator config changed
pull-ci-stolostron-thanos-release-2.11-ocm-ci-rbac	stolostron/thanos	presubmit	Ci-operator config changed
pull-ci-stolostron-thanos-release-2.11-pr-image-mirror	stolostron/thanos	presubmit	Ci-operator config changed
pull-ci-stolostron-thanos-release-2.11-test-unit	stolostron/thanos	presubmit	Ci-operator config changed

Prior to this PR being merged, you will need to either run and acknowledge or opt to skip these rehearsals.

Interacting with pj-rehearse

Comment: /pj-rehearse to run up to 5 rehearsals
Comment: /pj-rehearse skip to opt-out of rehearsals
Comment: /pj-rehearse {test-name}, with each test separated by a space, to run one or more specific rehearsals
Comment: /pj-rehearse more to run up to 10 rehearsals
Comment: /pj-rehearse max to run up to 25 rehearsals
Comment: /pj-rehearse auto-ack to run up to 5 rehearsals, and add the rehearsals-ack label on success
Comment: /pj-rehearse abort to abort all active rehearsals

Once you are satisfied with the results of the rehearsals, comment: /pj-rehearse ack to unblock merge. When the rehearsals-ack label is present on your PR, merge will no longer be blocked by rehearsals.
If you would like the rehearsals-ack label removed, comment: /pj-rehearse reject to re-block merging.

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: saswatamcode, subbarao-meduri

The full list of commands accepted by this bot can be found here.

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Needs approval from an approver in each of these files:

• ci-operator/config/stolostron/thanos/OWNERS [saswatamcode,subbarao-meduri]

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Approvers can cancel approval by writing /approve cancel in a comment

[subbarao-meduri]

/pj-rehearse pull-ci-stolostron-thanos-release-2.11-test-unit

[openshift-ci-robot]

@subbarao-meduri: now processing your pj-rehearse request. Please allow up to 10 minutes for jobs to trigger or cancel.

[subbarao-meduri]

/pj-rehearse pull-ci-stolostron-thanos-release-2.11-e2e-kind

[openshift-ci-robot]

@subbarao-meduri: now processing your pj-rehearse request. Please allow up to 10 minutes for jobs to trigger or cancel.

[subbarao-meduri]

/pj-rehearse ack

[openshift-ci-robot]

@subbarao-meduri: now processing your pj-rehearse request. Please allow up to 10 minutes for jobs to trigger or cancel.

[openshift-ci]

@subbarao-meduri: all tests passed!

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