NO-ISSUE: change branch to main for openshift/api ref in Makefile

[cheesesashimi]

- What I did

When openshift/release#62711 lands, we need to update our Makefile to reference main instead of master. With the path format referenced in our Makefile, GitHub will auto-redirect to main. However, we should still plan for it to be updated anyway.

NOTE: openshift/release#62711 must land first otherwise this change will not work.

- How to verify it

Run make bootstrap-e2e, which should pass. Alternatively, run the bootstrap-e2e CI job, which should also pass.

- Description for the changelog
Update API URL in Makefile for branch name change

[openshift-ci]

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cheesesashimi

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[openshift-ci-robot]

@cheesesashimi: This pull request explicitly references no jira issue.

In response to this:

- What I did

When openshift/release#62711 lands, we need to update our Makefile to reference main instead of master. With the path format referenced in our Makefile, GitHub will auto-redirect to main. However, we should still plan for it to be updated anyway.

- How to verify it

Run make bootstrap-e2e, which should pass. Alternatively, run the bootstrap-e2e CI job, which should also pass.

- Description for the changelog
Update API URL in Makefile for branch name change

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