ci: add checkout before setting up python

[ogabrielluiz]

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[github-actions]

Pull Request Validation Report

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Whitelist Report

Whitelist	Active	Result
Pull request is a draft and should be ignored	✅	❌
Pull request is made by a whitelisted user and should be ignored	❌	❌
Pull request is submitted by a bot and should be ignored	✅	❌
Pull request is submitted by administrators and should be ignored	❌	❌

Result

Pull request does not satisfy any enabled whitelist criteria. Pull request will be validated.

Validation Report

Validation	Active	Result
All commits in this pull request has valid messages	❌	✅
Pull request does not introduce too many changes	❌	✅
Pull request has a valid title	✅	✅
Pull request has mentioned issues	❌	✅
Pull request has valid branch name	❌	✅
Pull request should have a non-empty body	✅	❌

Result

Pull request is invalid.

Reason

• Pull request must have a non-empty body

_{Last Modified at 13 Aug 24 00:19 UTC}