MAINT: review action versions

[mmcky]

This PR

• [x] updates to the latest versions for GitHub actions

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[mmcky]

• [x] https://github.com/conda-incubator/setup-miniconda/issues/357

[mmcky]

• [ ] waiting to see if dependabot upgrades the actions for us automatically.

[mmcky]

Closing in favour of new dependabot PRs to keep all our infrastructure up to date and using the latest github action versions.