bump-formula-pr: cleanup

[SeekingMeaning]

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• Have you checked to ensure there aren't other open Pull Requests for the same change?
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---

#8004, #8022

• Dropped the word probably in error messages
• Removed all devel logic since it's deprecated

• -    return unless guesses.count > 1
  +    return if guesses.count <= 1

• -    version ||= Version.detect(url, tag ? { tag: tag } : {})
  +    unless version
  +      specs = tag ? { tag: tag } : {}
  +      version = Version.detect(url, specs)
  +    end

[MikeMcQuaid]

One nit then good to go. Thanks!

[MikeMcQuaid]

Suggested change

	specs = tag ? { tag: tag } : {}
	version = Version.detect(url, specs)
	specs = {}
	specs[:tag] = tag if tag
	version = Version.detect(url, specs)

[SeekingMeaning]

I didn't think of that, nice

[MikeMcQuaid]

Looks good, thanks for the follow-up PR and I'm 👍 to merge when you are.