Upgrade golangci-lint to 2.1.5

Author: sashabaranov

.github/workflows/pr.yml

@@ -20,7 +20,7 @@ jobs:
     - name: Run golangci-lint
       uses: golangci/golangci-lint-action@v6
       with:
-        version: v1.64.5
+        version: v2.1.5
     - name: Run tests
       run: go test -race -covermode=atomic -coverprofile=coverage.out -v ./...
     - name: Upload coverage reports to Codecov