Bump pygments from 2.19.2 to 2.20.0 #260

Job	Run time
build (ubuntu-latest, 3.11, false)	1m 26s
build (ubuntu-latest, 3.14t, false)	1m 50s
build (ubuntu-latest, pypy3.11, false)	3m 26s
build (macos-latest, 3.10, false)	1m 26s
build (ubuntu-latest, 3.10, false)	1m 39s
build (macos-latest, pypy3.11, false)	5m 16s
build (3.13, ubuntu-24.04-arm, false)	1m 25s
build (windows-latest, 3.10, false)	2m 2s
build (macos-latest, 3.11, false)	1m 2s
build (3.14, windows-11-arm, false)	2m 2s
build (ubuntu-latest, 3.12, false)	1m 31s
build (macos-latest, 3.14, false)	51s
build (3.14t, ubuntu-24.04-arm, false)	1m 52s
build (windows-latest, 3.12, false)	1m 40s
build (3.14, ubuntu-24.04-arm, false)	1m 47s
build (macos-latest, 3.14t, false)	1m 38s
build (windows-latest, 3.14t, false)	2m 48s
build (windows-latest, 3.13, false)	1m 43s
build (3.14t, windows-11-arm, false)	3m 8s
build (ubuntu-latest, 3.13, false)	1m 25s
build (windows-latest, 3.14, false)	1m 46s
build (3.13, windows-11-arm, false)	1m 45s
build (macos-latest, 3.13, false)	42s
build (macos-latest, 3.12, false)	55s
build (windows-latest, pypy3.11, false)	8m 43s
build (windows-latest, 3.11, false)	1m 47s
build (ubuntu-latest, 3.14, false)	1m 33s
	57m 8s

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