[release/v2.24] Bump Go version to 1.21.12

[archups]

What this PR does / why we need it: This PR is to update the Go version to 1.21.12 Related to https://github.com/kubermatic/infra/pull/2765

Which issue(s) this PR fixes:

Fixes #

What type of PR is this? /kind chore

Special notes for your reviewer:

Does this PR introduce a user-facing change? Then add your Release Note here:

Update Go version to 1.21.12

Documentation:

NONE

[kubermatic-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahmedwaleedmalik

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

The pull request process is described here

Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubermatic/dashboard/blob/release/v2.24/OWNERS)~~ [ahmedwaleedmalik] - ~~[modules/api/OWNERS](https://github.com/kubermatic/dashboard/blob/release/v2.24/modules/api/OWNERS)~~ [ahmedwaleedmalik] - ~~[modules/web/containers/OWNERS](https://github.com/kubermatic/dashboard/blob/release/v2.24/modules/web/containers/OWNERS)~~ [ahmedwaleedmalik] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[kubermatic-bot]

LGTM label has been added.

Git tree hash: d7cddae2a1292785b433606352c098b9ecc05837

[kubermatic-triage-bot]

/retest This bot automatically retries jobs that failed/flaked on approved PRs

Review the full test history

Silence the bot with an /lgtm cancel or /hold comment for consistent failures.