fix: Use [:space:] character class for spaces in regex

Fix the regex pattern to properly match spaces in dependency names
by using the [:space:] POSIX character class instead of a literal
space in the regex pattern.

This fixes CI failures for test cases that include spaces in the
dependency name like "Workflow args test script".

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: vaind

.github/workflows/updater.yml

@@ -78,7 +78,7 @@ jobs:
       - name: Validate dependency name
         run: |
           # Validate that inputs.name contains only safe characters
-          if [[ ! "${{ inputs.name }}" =~ ^[a-zA-Z0-9_\-\./@ ]+$ ]]; then
+          if [[ ! "${{ inputs.name }}" =~ ^[a-zA-Z0-9_\-\./@[:space:]]+$ ]]; then
             echo "::error::Invalid dependency name: '${{ inputs.name }}'. Only alphanumeric characters, spaces, and _-./@  are allowed."
             exit 1
           fi