Remove remaining unsafe #967

Job	Run time
cargo-deny	33s
Fuzz targets (afl)	2m 22s
build_benchmarks	1m 25s
clippy	3m 15s
public_private_dependencies	30s
rustfmt	19s
Fuzz targets (cargo-fuzz)	8m 11s
test_avif	2m 21s
test_avif_decoding	1m 51s
test_big_endian	1m 32s
test_big_endian (default)	4m 4s
test_big_endian (webp)	1m 27s
test_big_endian (webp-encoder)	3m 11s
test_features	44s
test_features (default)	2m 23s
test_features (gif)	41s
test_features (jpeg)	51s
test_features (png)	57s
test_features (tiff)	47s
test_features (ico)	50s
test_features (pnm)	47s
test_features (tga)	47s
test_features (webp)	54s
test_features (bmp)	48s
test_features (hdr)	49s
test_features (dxt)	36s
test_features (dds)	49s
test_features (farbfeld)	41s
test_features (openexr)	1m 20s
test_features (jpeg_rayon)	52s
test_features (webp-encoder)	1m 11s
verify_msrv	2m 45s
test_toolchains (1.61.0)	41s
test_toolchains (nightly)	1m 43s
test_toolchains (beta)	1m 47s
	54m 44s

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