pcx: Switch test images out #1683

Job	Run time
test_toolchains (1.70.0)	28s
test_features	26s
test_toolchains (nightly)	1m 19s
test_features (default)	2m 7s
test_toolchains (beta)	1m 33s
build_benchmarks	48s
Fuzz targets (afl)	2m 11s
test_features (rayon)	36s
test_features (avif)	59s
Fuzz targets (cargo-fuzz)	52s
test_features (bmp)	33s
cargo-deny	20s
cargo-semver-checks	35s
test_features (dds)	26s
test_features (exr)	42s
public_private_dependencies	23s
test_features (ff)	26s
rustfmt	4s
test_avif_decoding	1m 17s
test_features (gif)	33s
test_other_archs (powerpc-unknown-linux-gnu)	2m 42s
test_features (hdr)	31s
test_other_archs (i686-unknown-linux-gnu)	1m 30s
test_features (ico)	40s
clippy	2m 7s
test_features (jpeg)	29s
test_features (pcx)	29s
test_features (png)	42s
test_features (pnm)	27s
test_features (qoi)	27s
test_features (tga)	28s
test_features (tiff)	36s
test_features (webp)	31s
	28m 17s

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