📖 update clusterctl version to v1.5.x in quick start

[nawazkh]

What this PR does / why we need it:
Updates clusterctl version to v1.5.x in quickstart.
Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[nawazkh]

/cc @sbueringer @killianmuldoon

[sbueringer]

Thx
/lgtm
/approve

/cherry-pick release-1.5

[k8s-infra-cherrypick-robot]

@sbueringer: once the present PR merges, I will cherry-pick it on top of release-1.5 in a new PR and assign it to you.

In response to this:

Thx
/lgtm
/approve

/cherry-pick release-1.5

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/test-infra repository.

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: b7fb59347ee7090e94be0b5bc294853f2f7d20a2

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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[k8s-infra-cherrypick-robot]

@sbueringer: new pull request created: #9082

In response to this:

Thx
/lgtm
/approve

/cherry-pick release-1.5

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/test-infra repository.