📖 Update clusterctl version to v1.8.x in quick start

[chandankumar4]

What this PR does / why we need it:

• Update clusterctl version to v1.8.x in quick start

/area documentation
/cherry-pick release-1.8

Part of #10472

[k8s-ci-robot]

Hi @chandankumar4. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[chandankumar4]

/cherry-pick release-1.8

[k8s-infra-cherrypick-robot]

@chandankumar4: only kubernetes-sigs org members may request cherry picks. If you are already part of the org, make sure to change your membership to public. Otherwise you can still do the cherry-pick manually.

In response to this:

/cherry-pick release-1.8

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.

[sbueringer]

Thx!

/lgtm
/approve
/ok-to-test

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: b20366b72aa7de83c3c2053228abcee9acc903f0

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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[sbueringer]

/cherry-pick release-1.8

[k8s-infra-cherrypick-robot]

@sbueringer: new pull request created: #11058

In response to this:

/cherry-pick release-1.8

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.