Unable to Parse Ruby Version from .tool-versions Since v1.222.0

[Karibash]

Since version v1.222.0, the tool is unable to correctly parse the Ruby version from the .tool-versions file. This issue was introduced by PR #717, which changed the version parsing logic.

Steps to Reproduce

1. Create a .tool-versions file with multiple spaces between the tool name and version:

flutter 3.29.1  
ruby    3.4.2  

2. Try to retrieve the Ruby version using the tool.

Expected Behavior

The tool should correctly parse and return the Ruby version (3.4.2).

Actual Behavior

The tool fails to retrieve the Ruby version when multiple spaces exist between the tool name and version.