Re-enable rust, fix ubuntu 18 failure #9

Job	Run time
Rust builds (using Delta extension) / Generate matrix	21s
Extension template / Generate matrix	22s
Rust builds (using Delta extension) / MacOS (osx_amd64, x86_64, x64-osx)	7m 7s
Rust builds (using Delta extension) / Linux (linux_amd64, ubuntu:18.04, x64-linux)	28m 41s
Rust builds (using Delta extension) / MacOS (osx_arm64, arm64, arm64-osx)	6m 48s
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)	28m 19s
Rust builds (using Delta extension) / Linux (linux_arm64, ubuntu:18.04, arm64-linux)	30m 49s
Rust builds (using Delta extension) / Windows (windows_amd64, x64-windows-static-md)	35m 15s
Extension template / Linux (linux_amd64, ubuntu:18.04, x64-linux)	15m 1s
Extension template / DuckDB-Wasm (wasm_mvp, wasm32-emscripten)	1m 59s
Extension template / MacOS (osx_amd64, x86_64, x64-osx)	5m 57s
Extension template / Linux (linux_amd64_gcc4, quay.io/pypa/manylinux2014_x86_64, x64-linux)	13m 35s
Extension template / DuckDB-Wasm (wasm_eh, wasm32-emscripten)	2m 6s
Extension template / MacOS (osx_arm64, arm64, arm64-osx)	3m 11s
Extension template / Linux (linux_arm64, ubuntu:18.04, arm64-linux)	17m 43s
Extension template / DuckDB-Wasm (wasm_threads, wasm32-emscripten)	1m 49s
Extension template / Windows (windows_amd64, x64-windows-static-md)	19m 49s
Extension template / Windows (windows_amd64_rtools, x64-mingw-static)	38m 27s
	4h 17m 19s

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