Revert to use admin token for release checkout action

[KIRA009]

What kind of change does this PR introduce?
This reverts a change that was made earlier, to use the secrets.ADMIN_TOKEN for the release checkout action

Summary
It looks like because the checkout action was carried out with a token, there are issues in further actions when trying to push to the protected main branch.

https://github.com/OpenAdaptAI/OpenAdapt/actions/runs/8910687505/job/24470804634 - semantic release action failed. The only change w.r.t tokens from when the action was passing, is the secrets.ADMIN_TOKEN being passed to the checkout action earlier

Checklist

• My code follows the style guidelines of OpenAdapt
• I have performed a self-review of my code
• If applicable, I have added tests to prove my fix is functional/effective
• I have linted my code locally prior to submission
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (e.g. README.md, requirements.txt)
• New and existing unit tests pass locally with my changes