Downgrade zip, as 2.3 fails with wasm.. #521

Job	Run time
rust_ci (ubuntu-latest, stable)	1m 31s
rust_ci (ubuntu-latest, nightly)	1m 29s
rust_ci (macos-latest, stable)	1m 8s
rust_ci (ubuntu-latest, beta)	1m 34s
rust_ci (macos-latest, nightly)	1m 20s
rust_ci (macos-latest, beta)	1m 21s
rust_ci (windows-latest, beta)	2m 45s
rust_ci (windows-latest, stable)	2m 40s
rust_ci (windows-latest, nightly)	2m 51s
	16m 39s

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