Bump pymdown-extensions from 10.12 to 10.13 #1443

Job	Run time
Build extension	1m 3s
Build docs	51s
Build	2m 33s
🔍 Analyze with CodeQL	3m 27s
🔍 Analyze with DevSkim	39s
🔍 Analyze with PSRule	33s
🧪 Test extension (ubuntu-latest)	40s
🧪 Test extension (windows-latest)	3m 21s
🧪 Test extension (macos-latest)	43s
🧪 Test (linux-x64-pwsh)	1m 36s
🧪 Test (win-x64-pwsh)	1m 30s
🧪 Test (win-x64-powershell)	3m 25s
🧪 Test (linux-musl-x64-pwsh)	52s
🧪 Test (osx-x64-pwsh)	53s
	22m 6s

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