Remove remaining unsafe #965

Job	Run time
test_features	1m 10s
test_features (default)	2m 20s
test_features (gif)	1m 1s
test_features (jpeg)	1m 16s
test_features (png)	47s
test_features (tiff)	47s
test_features (ico)	1m 14s
test_features (pnm)	39s
test_features (tga)	44s
test_features (webp)	50s
test_features (bmp)	1m 20s
test_features (hdr)	1m 14s
test_features (dxt)	1m 20s
test_features (dds)	1m 5s
test_features (farbfeld)	1m 3s
test_features (openexr)	1m 28s
test_features (jpeg_rayon)	1m 13s
test_features (webp-encoder)	1m 15s
clippy	3m 21s
Fuzz targets (afl)	2m 9s
Fuzz targets (cargo-fuzz)	8m 13s
test_avif	1m 49s
test_avif_decoding	1m 54s
test_big_endian	2m 0s
test_big_endian (default)	4m 51s
test_big_endian (webp)	1m 49s
test_big_endian (webp-encoder)	3m 24s
test_toolchains (1.61.0)	1m 22s
test_toolchains (nightly)	2m 39s
test_toolchains (beta)	2m 10s
build_benchmarks	1m 10s
cargo-deny	37s
public_private_dependencies	31s
rustfmt	17s
verify_msrv	3m 21s
	1h 2m 23s

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