Update workflows to use latest versions of actions

[t1m0thyj]

Describe your pull request here: See title

List the file(s) included in this PR: build-docs.yml, deploy-preview.yml

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[github-actions[bot]]

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[github-actions[bot]]

:file_folder: The PR description is missing the file name(s) for the updated content. List all the files included in this PR so this information displays in our Zowe Docs GitHub Slack channel.

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[t1m0thyj]

Closing, will reopen not from a fork 😋