Fix a returning type of unique_ptr<SetStatement> StatementGenerator::GenerateSet() #21

Job	Run time
Build extension binaries / Generate matrix	27s
Build extension binaries / DuckDB-Wasm (wasm_mvp, wasm32-emscripten)	2m 16s
Build extension binaries / Windows (windows_amd64, x64-windows-static-md)	24m 17s
Build extension binaries / MacOS (osx_amd64, x86_64, x64-osx)	13m 41s
Build extension binaries / DuckDB-Wasm (wasm_eh, wasm32-emscripten)	2m 5s
Build extension binaries / Linux (linux_amd64, ubuntu:18.04, x64-linux)	17m 46s
Build extension binaries / Windows (windows_amd64_rtools, x64-mingw-static)	49m 16s
Build extension binaries / DuckDB-Wasm (wasm_threads, wasm32-emscripten)	2m 19s
Build extension binaries / MacOS (osx_arm64, arm64, arm64-osx)	12m 40s
Build extension binaries / Linux (linux_amd64_gcc4, quay.io/pypa/manylinux2014_x86_64, x64-linux)	15m 9s
Build extension binaries / Linux (linux_arm64, ubuntu:18.04, arm64-linux)	19m 12s
Deploy extension binaries / Generate matrix	23s
Deploy extension binaries / Deploy (linux_amd64)	31s
Deploy extension binaries / Deploy (linux_amd64_gcc4)	29s
Deploy extension binaries / Deploy (linux_arm64)	33s
Deploy extension binaries / Deploy (osx_amd64)	29s
Deploy extension binaries / Deploy (osx_arm64)	36s
Deploy extension binaries / Deploy (windows_amd64)	30s
Deploy extension binaries / Deploy (windows_amd64_rtools)	29s
Deploy extension binaries / Deploy (wasm_mvp)	30s
Deploy extension binaries / Deploy (wasm_eh)	28s
Deploy extension binaries / Deploy (wasm_threads)	32s
	2h 44m 38s

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