Fix Linux CI segfault by using synchronous httplib task queue. #476

Job	Run time
Build extension binaries / Generate matrix	4s
Build extension binaries / Linux (linux_arm64, ubuntu-24.04-arm, arm64-linux-release, arm64-linux-release, false, false)	6m 3s
Build extension binaries / Linux (linux_amd64, ubuntu-24.04, x64-linux-release, x64-linux-release, true, false)	6m 5s
Build extension binaries / MacOS (osx_amd64, x86_64, x64-osx-release, arm64-osx-release, false, false)	2m 41s
Build extension binaries / Windows (windows_amd64, windows-latest, x64-windows-static-release, x64-windows-static-release, t...	10m 2s
Build extension binaries / MacOS (osx_arm64, arm64, arm64-osx-release, arm64-osx-release, true, false)	20m 49s
Build extension binaries / DuckDB-Wasm (wasm_eh, wasm32-emscripten, x64-linux, false, false)	11m 55s
Build extension binaries / Windows (windows_amd64_mingw, windows-latest, x64-mingw-static, x64-mingw-static, true, false)	34m 48s
Build extension binaries / DuckDB-Wasm (wasm_threads, wasm32-emscripten, x64-linux, false, false)	7m 51s
Build extension binaries / DuckDB-Wasm (wasm_mvp, wasm32-emscripten, x64-linux, true, false)	11m 51s
	1h 52m 9s

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