Fix source dist and wheels are not being built in CI

[danyeaw]

When trying to release a new version, I found that the build source dist and wheel step was being skipped due to the wrong variable. I also cleaned up some action usage and bumped the dependencies.

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PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Documentation content changes

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

[amolenaar]

This looks like a nice bit of cleanup. Thanks 😊