Allow installing major version with trailing zero

[swissspidy]

Bug Report

• Yes, I reviewed the contribution guidelines.
• Yes, more specifically, I reviewed the guidelines on how to write clear bug reports.

Describe the current, buggy behavior

I should be able to run wp core update --version=6.7.0 instead of wp core update --version=6.7

Describe how other contributors can replicate this bug

Run wp core update --version=6.7.0

It doesn't work because it looks for a https://wordpress.org/wordpress-6.7.0.zip ZIP file that doesn't exist.

Describe what you would expect as the correct outcome

Using this version should work.

Let us know what environment you are running this on

n/a

Provide a possible solution

We should just turn 6.7.0 into 6.7.

Provide additional context/Screenshots

Add any other context about the problem here.

If applicable, add screenshots to help explain (you can just drag&drop images into the Github issue).