remove windows_amd64_rtools build #726

Job	Run time
prepare	4s
build / Generate matrix	6s
build / Linux (linux_amd64, ubuntu:18.04, x64-linux)	6m 32s
build / DuckDB-Wasm	0s
build / MacOS (osx_amd64, x86_64, x64-osx)	5m 25s
build / Linux (linux_amd64_gcc4, quay.io/pypa/manylinux2014_x86_64, x64-linux)	5m 52s
build / Windows (windows_amd64, x64-windows-static-md)	27m 5s
build / MacOS (osx_arm64, arm64, arm64-osx)	5m 18s
build / Linux (linux_arm64, ubuntu:18.04, arm64-linux)	11m 19s
build / Windows (windows_amd64_mingw, x64-mingw-static)	55m 59s
build / Linux (linux_amd64_musl, alpine:3, x64-linux)	10m 14s
doc_test / docs	12s
deploy / Generate matrix	47s
archive	0s
deploy / Deploy (linux_amd64)	38s
deploy / Deploy (linux_amd64_gcc4)	34s
deploy / Deploy (linux_arm64)	32s
deploy / Deploy (osx_amd64)	32s
deploy / Deploy (osx_arm64)	35s
deploy / Deploy (windows_amd64)	34s
deploy / clean_cache (linux_arm64) / Clean Caches	2s
deploy / clean_cache (osx_amd64) / Clean Caches	5s
deploy / clean_cache (osx_arm64) / Clean Caches	6s
deploy / clean_cache (linux_amd64) / Clean Caches	3s
deploy / clean_cache (linux_amd64_gcc4) / Clean Caches	9s
deploy / clean_cache (windows_amd64) / Clean Caches	10s
	2h 12m 53s

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