Use slightly older golangci-lint

Avoid dealing with removed deprecated plugins for now.

Author: bluekeyes

.github/workflows/go.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Lint
         uses: golangci/golangci-lint-action@v6
         with:
-          version: v1.59
+          version: v1.56
 
       - name: Test
         run: go test -v ./...