Pin Pygments. #114

Job	Run time
aarch64-apple-darwin/clang	10m 52s
x86_64-unknown-linux-gnu/gcc-free-threading	8m 49s
x86_64-apple-darwin/clang	16m 9s
x86_64-unknown-linux-gnu/gcc	10m 30s
aarch64-unknown-linux-gnu/gcc	6m 43s
	53m 3s

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