fix: update to goreleaser-action v6

- Upgrade from v5 to v6 of goreleaser-action
- v6 defaults to GoReleaser v2
- Should resolve any compatibility issues

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

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

Author: jackspirou

.github/workflows/release.yaml

@@ -37,7 +37,7 @@ jobs:
         go-version: '1.24'
 
     - name: Run GoReleaser
-      uses: goreleaser/goreleaser-action@v5
+      uses: goreleaser/goreleaser-action@v6
       with:
         distribution: goreleaser
         version: '~> v2'