Pass through rayon feature to ravif #1635

Job	Run time
clippy	2m 11s
test_avif_decoding	1m 22s
test_other_archs (powerpc-unknown-linux-gnu)	2m 25s
test_features	18s
test_other_archs (i686-unknown-linux-gnu)	1m 19s
test_toolchains (1.79.0)	35s
test_features (default)	1m 54s
build_benchmarks	46s
test_toolchains (nightly)	1m 12s
test_features (rayon)	39s
test_toolchains (beta)	1m 19s
test_features (avif)	58s
Fuzz targets (afl)	2m 11s
Fuzz targets (cargo-fuzz)	49s
test_features (bmp)	21s
test_features (dds)	22s
cargo-deny	17s
cargo-semver-checks	21s
test_features (exr)	41s
test_features (ff)	24s
rustfmt	7s
test_features (gif)	31s
public_private_dependencies	24s
test_features (hdr)	16s
test_features (ico)	30s
test_features (jpeg)	28s
test_features (png)	24s
test_features (pnm)	34s
test_features (qoi)	16s
test_features (tga)	17s
test_features (tiff)	26s
test_features (webp)	21s
	24m 58s

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