Re-enable rust, fix ubuntu 18 failure #8

Job	Run time
Extension template / Generate matrix	23s
Rust builds (using Delta extension) / Generate matrix	22s
Rust builds (using Delta extension) / Linux (linux_amd64, ubuntu:18.04, x64-linux)	6m 46s
Rust builds (using Delta extension) / MacOS (osx_amd64, x86_64, x64-osx)	6m 45s
Rust builds (using Delta extension) / DuckDB-Wasm	0s
Rust builds (using Delta extension) / Linux (linux_amd64_gcc4, quay.io/pypa/manylinux2014_x86_64, x64-linux)	6m 53s
Rust builds (using Delta extension) / MacOS (osx_arm64, arm64, arm64-osx)	8m 35s
Rust builds (using Delta extension) / Windows (windows_amd64, x64-windows-static-md)	37m 32s
Rust builds (using Delta extension) / Linux (linux_arm64, ubuntu:18.04, arm64-linux)	6m 37s
Extension template / MacOS (osx_amd64, x86_64, x64-osx)	5m 50s
Extension template / Linux (linux_amd64, ubuntu:18.04, x64-linux)	3m 42s
Extension template / MacOS (osx_arm64, arm64, arm64-osx)	2m 36s
Extension template / DuckDB-Wasm (wasm_mvp, wasm32-emscripten)	1m 52s
Extension template / Linux (linux_amd64_gcc4, quay.io/pypa/manylinux2014_x86_64, x64-linux)	3m 51s
Extension template / Windows (windows_amd64, x64-windows-static-md)	19m 27s
Extension template / DuckDB-Wasm (wasm_eh, wasm32-emscripten)	1m 54s
Extension template / Linux (linux_arm64, ubuntu:18.04, arm64-linux)	3m 37s
Extension template / Windows (windows_amd64_rtools, x64-mingw-static)	43m 54s
Extension template / DuckDB-Wasm (wasm_threads, wasm32-emscripten)	1m 46s
	2h 42m 22s

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