fix: update golangci-lint to v2.1.6 for Go 1.24 compatibility

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: mromaszewicz

Makefile

@@ -10,7 +10,7 @@ help:
 	@echo "    tidy         tidy go mod"
 
 $(GOBIN)/golangci-lint:
-	curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(GOBIN) v1.59.0
+	curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(GOBIN) v2.1.6
 
 .PHONY: tools
 tools: $(GOBIN)/golangci-lint
@@ -19,7 +19,7 @@ lint: tools
 	$(GOBIN)/golangci-lint run ./...
 
 lint-ci: tools
-	$(GOBIN)/golangci-lint run ./... --out-format=github-actions --timeout=5m
+	$(GOBIN)/golangci-lint run ./... --output.text.path=stdout --timeout=5m
 
 generate:
 	go generate ./...