chore: Revert using SHAs in GitHub workflows

[alimpens]

Describe the pull request

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What

It reverts using SHAs instead of version numbers in our GitHub workflows.

Why

Using SHAs is a good idea (see this for more info), but our organisation GitHub Action allowlist uses version number currently, which means the Actions using SHAs are blocked. We have to change the allowlist first before implementing this again.

How

Copy-pasting the old values back. I couldn't revert the files in their entirety, because I wanted to keep some of the changes.

Checklist

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• Add or update unit tests
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