fix: correct version extraction from tag in workflow

Remove 'v' prefix assumption since our tags are numeric only (1.4.3 not v1.4.3).
This was causing version to be 'refs/tags/1.4.3' instead of '1.4.3'.

Author: Arul-

.github/workflows/publish-mcp-registry.yml

@@ -18,7 +18,7 @@ jobs:
       - name: Get version from tag
         id: get_version
         run: |
-          VERSION=${GITHUB_REF#refs/tags/v}
+          VERSION=${GITHUB_REF#refs/tags/}
           echo "version=$VERSION" >> $GITHUB_OUTPUT
           echo "Publishing version: $VERSION"