Update magnus and rb-sys, refactor error handling #699

Job	Run time
ci-data	5s
Compile native gem for x86_64-linux	8m 50s
Compile native gem for aarch64-linux	6m 1s
Compile native gem for x64-mingw-ucrt	6m 3s
Compile native gem for arm64-darwin	6m 2s
Compile native gem for aarch64-linux-musl	6m 12s
Compile native gem for x86_64-darwin	6m 6s
Compile native gem for x86_64-linux-musl	6m 5s
	45m 24s

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