Bump actions/download-artifact from 1 to 4 in /.github/workflows #185

Job	Run time
Rustfmt	2m 43s
Bench (current, refs/pull/184/merge)	6m 4s
Bench (base, main)	4m 9s
Test Suite (stable)	7m 5s
Builds (ubuntu-22.04, aarch64-linux-android)	1m 24s
Test Suite (beta)	6m 55s
Builds (ubuntu-22.04, x86_64-unknown-linux-musl)	1m 12s
Builds (ubuntu-22.04, wasm32-unknown-unknown, --features wasm --no-default-features)	3m 9s
Test Suite (1.70.0)	7m 34s
Builds (macos-12, aarch64-apple-ios)	1m 26s
Builds (macos-12, x86_64-apple-darwin)	3m 40s
Builds (macos-12, aarch64-apple-darwin)	1m 52s
Builds (windows-2019, x86_64-pc-windows-msvc)	5m 44s
Upload benchmark results	3m 13s
	56m 10s

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