Pin pymdown-extensions back to 11.0 (#3106) #3507

Job	Run time
checks / docs	1m 5s
checks / pre-commit	53s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 26s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 16s
checks / test (3.10, locked, ubuntu-latest)	1m 29s
checks / readme-snippets	12s
checks / test (3.12, locked, ubuntu-latest)	1m 38s
checks / test (3.10, lowest-direct, windows-latest)	1m 47s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 25s
checks / test (3.13, locked, windows-latest)	1m 57s
checks / test (3.12, locked, windows-latest)	1m 43s
checks / test (3.10, locked, windows-latest)	2m 3s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 18s
checks / test (3.11, locked, ubuntu-latest)	1m 21s
checks / test (3.11, locked, windows-latest)	2m 2s
checks / test (3.14, locked, ubuntu-latest)	1m 23s
checks / test (3.13, lowest-direct, windows-latest)	2m 7s
checks / test (3.11, lowest-direct, windows-latest)	2m 13s
checks / test (3.12, lowest-direct, windows-latest)	2m 7s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 15s
checks / test (3.14, locked, windows-latest)	1m 53s
checks / test (3.13, locked, ubuntu-latest)	1m 12s
checks / test (3.14, lowest-direct, windows-latest)	1m 57s
all-green	3s
	35m 45s

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