Fix cargo-afl installation #963

Job	Run time
test_toolchains (1.61.0)	57s
test_toolchains (nightly)	2m 30s
test_toolchains (beta)	1m 57s
test_avif	2m 37s
test_big_endian	1m 34s
test_big_endian (default)	3m 28s
test_big_endian (webp)	2m 0s
test_big_endian (webp-encoder)	4m 6s
test_features	58s
test_features (default)	2m 9s
test_features (gif)	1m 4s
test_features (jpeg)	1m 4s
test_features (png)	57s
test_features (tiff)	1m 15s
test_features (ico)	57s
test_features (pnm)	57s
test_features (tga)	47s
test_features (webp)	57s
test_features (bmp)	1m 2s
test_features (hdr)	51s
test_features (dxt)	56s
test_features (dds)	1m 1s
test_features (farbfeld)	1m 5s
test_features (openexr)	1m 26s
test_features (jpeg_rayon)	58s
test_features (webp-encoder)	1m 50s
Fuzz targets (cargo-fuzz)	6m 54s
cargo-deny	31s
build_benchmarks	1m 21s
Fuzz targets (afl)	2m 22s
clippy	4m 2s
public_private_dependencies	39s
test_avif_decoding	2m 12s
rustfmt	19s
verify_msrv	2m 51s
	1h 0m 34s

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