Fix CI workflow for main branch

[HiDeoo]

This PR attempts to fix the main branch CI failure due to #2077.

Skipping checkout seems to only be possible for PRs but as we're running this workflow on push to the main branch too, we need to checkout the code first in the changes job.

Extra PRs that seems to have fixed the same issue using the same solution:

• https://github.com/JuliaTime/TZJData.jl/pull/25/files
• https://github.com/bountonw/translate/pull/312/files

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Latest commit: b94c07e

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Name	Status	Preview	Updated (UTC)
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[delucis]

Thanks for diagnosing and fixing this so quickly @HiDeoo!