Update GitRemote#normalize to support organizations prefixed with a number

[bryceatmoderne]

What's changed?

GitRemote#normalize was incorrectly identifying an organization starting with a number, such 1org, as a port number. These changes update the regex Pattern to match a numerical string up to a forward slash.

What's your motivation?

Some repositories such as https://github.com/1Remote/1Remote were failing to build using the Moderne CLI.

Anything in particular you'd like reviewers to focus on?

No

Anyone you would like to review specifically?

@pstreef

Have you considered any alternatives or workarounds?

No

Any additional context

No

Checklist

• I've added unit tests to cover both positive and negative cases
• I've read and applied the recipe conventions and best practices
• I've used the IntelliJ IDEA auto-formatter on affected files