docs: improve version input description in wheels workflow

- Update description to clarify that version is optional
- Explain that setuptools_scm will determine version automatically if not provided
- Improve user experience for workflow dispatch

Author: WhizZest

.github/workflows/wheels.yml

@@ -4,7 +4,7 @@ on:
   workflow_dispatch:
     inputs:
       version:
-        description: 'Release version'
+        description: 'Release version (optional, will be determined by setuptools_scm if not provided)'
         required: false
 
 jobs: