Change go version to 1.21

[vishesh92]

Issue #, if available:

Description of changes:

Testing performed:

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 24.78%. Comparing base (d597e80) to head (f0e183b).
Report is 37 commits behind head on main.

Files	Patch %	Lines
controllers/cloudstackmachine_controller.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #374      +/-   ##
==========================================
- Coverage   25.66%   24.78%   -0.88%     
==========================================
  Files          59       59              
  Lines        5563     4760     -803     
==========================================
- Hits         1428     1180     -248     
+ Misses       3996     3455     -541     
+ Partials      139      125      -14     

☔ View full report in Codecov by Sentry.
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[blueorangutan]

Setting up environment failed

[rohityadavcloud]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rohityadavcloud, vishesh92

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[blueorangutan]

Test Results : (tid-491)
Environment: kvm Rocky8(x3), Advanced Networking with Management Server Rocky8
Kubernetes Version: v1.27.2
Kubernetes Version upgrade from: v1.26.5
Kubernetes Version upgrade to: v1.27.2
CloudStack Version: 4.19
Template: ubuntu-2004-kube
E2E Test Run Logs: https://github.com/blueorangutan/capc-prs/releases/download/capc-pr-ci-cd/capc-e2e-artifacts-pr374-sl-491.zip

Summarizing 3 Failures:
 [FAIL] When testing Kubernetes version upgrades [It] Should successfully upgrade kubernetes versions when there is a change in relevant fields
 /root/go/pkg/mod/sigs.k8s.io/cluster-api/[email protected]/framework/machinedeployment_helpers.go:127
 [FAIL] When testing affinity group [It] Should have host affinity group when affinity is pro
 /jenkins/workspace/capc-e2e-new/test/e2e/common.go:348
 [TIMEDOUT] When testing machine remediation [It] Should replace a machine when it is destroyed
 /jenkins/workspace/capc-e2e-new/test/e2e/machine_remediation.go:59

Ran 27 of 30 Specs in 10784.817 seconds
FAIL! - Suite Timeout Elapsed -- 24 Passed | 3 Failed | 0 Pending | 3 Skipped
--- FAIL: TestE2E (10784.82s)
FAIL