Fix a returning type of unique_ptr<SetStatement> StatementGenerator::GenerateSet() #22

Job	Run time
Build extension binaries / Generate matrix	1m 16s
Build extension binaries / Windows (windows_amd64, x64-windows-static-md)	22m 7s
Build extension binaries / DuckDB-Wasm (wasm_mvp, wasm32-emscripten)	2m 11s
Build extension binaries / Windows (windows_amd64_rtools, x64-mingw-static)	42m 55s
Build extension binaries / MacOS (osx_amd64, x86_64, x64-osx)	11m 15s
Build extension binaries / DuckDB-Wasm (wasm_eh, wasm32-emscripten)	5m 7s
Build extension binaries / Linux (linux_amd64, ubuntu:18.04, x64-linux)	17m 20s
Build extension binaries / MacOS (osx_arm64, arm64, arm64-osx)	10m 36s
Build extension binaries / Linux (linux_amd64_gcc4, quay.io/pypa/manylinux2014_x86_64, x64-linux)	13m 44s
Build extension binaries / DuckDB-Wasm (wasm_threads, wasm32-emscripten)	2m 13s
Build extension binaries / Linux (linux_arm64, ubuntu:18.04, arm64-linux)	19m 4s
Deploy extension binaries / Generate matrix	22s
Deploy extension binaries / Deploy (linux_amd64)	29s
Deploy extension binaries / Deploy (linux_amd64_gcc4)	34s
Deploy extension binaries / Deploy (linux_arm64)	30s
Deploy extension binaries / Deploy (osx_amd64)	34s
Deploy extension binaries / Deploy (osx_arm64)	28s
Deploy extension binaries / Deploy (windows_amd64)	28s
Deploy extension binaries / Deploy (windows_amd64_rtools)	36s
Deploy extension binaries / Deploy (wasm_mvp)	42s
Deploy extension binaries / Deploy (wasm_eh)	31s
Deploy extension binaries / Deploy (wasm_threads)	30s
	2h 33m 32s

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