Fill in changelog and bump version for 0.25.3 #1626

Job	Run time
Fuzz targets (cargo-fuzz)	47s
cargo-deny	21s
build_benchmarks	45s
Fuzz targets (afl)	2m 33s
cargo-semver-checks	26s
clippy	2m 33s
public_private_dependencies	22s
rustfmt	5s
test_avif_decoding	1m 57s
test_features	21s
test_other_archs (powerpc-unknown-linux-gnu)	2m 24s
test_features (default)	1m 58s
test_toolchains (1.67.1)	36s
test_other_archs (i686-unknown-linux-gnu)	1m 23s
test_features (rayon)	23s
test_toolchains (nightly)	1m 9s
test_features (avif)	53s
test_toolchains (beta)	1m 18s
test_features (bmp)	19s
test_features (dds)	18s
test_features (exr)	40s
test_features (ff)	18s
test_features (gif)	20s
test_features (hdr)	19s
test_features (ico)	41s
test_features (jpeg)	30s
test_features (png)	21s
test_features (pnm)	16s
test_features (qoi)	22s
test_features (tga)	18s
test_features (tiff)	28s
test_features (webp)	22s
	25m 46s

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