Bump pygments from 2.19.2 to 2.20.0 #786

Job	Run time
Build sdist and wheels	9s
Test Windows (windows-latest, 3.13)	8m 21s
Test Windows (windows-latest, 3.12)	8m 52s
Test macOS (macos-latest, 3.12)	43m 19s
Test macOS (macos-latest, 3.11)	44m 39s
Test Windows (windows-latest, 3.11)	9m 27s
Test macOS (macos-latest, 3.13)	48m 53s
Test macOS (macos-latest, 3.14)	45m 47s
Test Windows (windows-latest, 3.14)	7m 43s
Test ubuntu-24.04 with Python 3.11	6m 4s
Test ubuntu-22.04 with Python 3.11	6m 22s
Test ubuntu-22.04 with Python 3.14	6m 24s
Test ubuntu-24.04 with Python 3.12	6m 14s
Test ubuntu-24.04 with Python 3.13	5m 39s
Test ubuntu-22.04 with Python 3.13	6m 19s
Test ubuntu-22.04 with Python 3.12	6m 12s
Test ubuntu-24.04 with Python 3.14	5m 36s
Build Alpine-based Docker images	-1s
Build Ubuntu-based Docker image	-1s
Stage release artifacts	-1s
	4h 25m 57s

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