Bump actions/download-artifact from 1 to 4 in /.github/workflows #182

Job	Run time
Rustfmt	2m 42s
Bench (current, refs/pull/184/merge)	6m 16s
Test Suite (stable)	6m 44s
Bench (base, main)	4m 4s
Builds (ubuntu-22.04, aarch64-linux-android)	1m 47s
Test Suite (beta)	6m 31s
Builds (ubuntu-22.04, x86_64-unknown-linux-musl)	1m 46s
Test Suite (1.60.0)	3m 0s
Builds (ubuntu-22.04, wasm32-unknown-unknown, --features wasm --no-default-features)	3m 39s
Builds (macos-12, aarch64-apple-ios)	2m 43s
Builds (macos-12, x86_64-apple-darwin)	2m 15s
Builds (macos-12, aarch64-apple-darwin)	4m 25s
Builds (windows-2019, x86_64-pc-windows-msvc)	5m 30s
Upload benchmark results	3m 23s
	54m 45s

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