build(download): the GHES versions are now strings

[wolfy1339]

Follow-up to #334

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Before the change?

• The returned versions were float and now are string
• Uses float in the download script

After the change?

• Removes float usage

Pull request checklist

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

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[github-actions]

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[octokitbot]

🎉 This PR is included in version 18.1.0 🎉

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