Fill in changelog and bump version for 0.25.3 #1629

Job	Run time
test_avif_decoding	1m 19s
test_toolchains (1.67.1)	56s
test_toolchains (nightly)	1m 6s
test_features	18s
build_benchmarks	47s
test_toolchains (beta)	1m 21s
test_features (default)	1m 55s
Fuzz targets (afl)	2m 7s
test_features (rayon)	21s
test_features (avif)	52s
Fuzz targets (cargo-fuzz)	51s
cargo-deny	18s
test_features (bmp)	19s
cargo-semver-checks	21s
clippy	3m 0s
public_private_dependencies	23s
test_features (dds)	18s
rustfmt	5s
test_features (exr)	35s
test_other_archs (powerpc-unknown-linux-gnu)	2m 28s
test_other_archs (i686-unknown-linux-gnu)	1m 15s
test_features (ff)	19s
test_features (gif)	33s
test_features (hdr)	19s
test_features (ico)	45s
test_features (jpeg)	18s
test_features (png)	29s
test_features (pnm)	23s
test_features (qoi)	17s
test_features (tga)	27s
test_features (tiff)	26s
test_features (webp)	21s
	25m 32s

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