chore(deps-dev): bump mkdocs-material from 9.1.18 to 9.1.20 #847

Job	Run time
Lint and type checks	45s
Test Python 3.7 on Ubuntu	47s
Test Python 3.8 on Ubuntu	44s
Test Python 3.9 on Ubuntu	59s
Test Python 3.10 on Ubuntu	1m 0s
Test Python 3.11 on Ubuntu	47s
Test Python 3.7 on Windows	1m 28s
Test Python 3.8 on Windows	1m 10s
Test Python 3.9 on Windows	2m 20s
Test Python 3.10 on Windows	1m 20s
Test Python 3.11 on Windows	1m 10s
Test Python 3.7 on macOS	1m 18s
Test Python 3.8 on macOS	1m 24s
Test Python 3.9 on macOS	1m 27s
Test Python 3.10 on macOS	3m 0s
Test Python 3.11 on macOS	2m 13s
Build assets and deploy on tags	11s
	22m 3s

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