chore(deps-dev): bump mkdocs-material from 9.6.14 to 9.6.21 #994

Job	Run time
Lint and type checks	38s
Test Python 3.12 on ubuntu-latest	47s
Test Python 3.8 on ubuntu-latest	55s
Test Python 3.11 on ubuntu-latest	51s
Test Python 3.12 on macos-latest	46s
Test Python 3.8 on windows-latest	2m 6s
Test Python 3.11 on windows-latest	1m 50s
Test Python 3.8 on macos-latest	1m 28s
Test Python 3.9 on windows-latest	2m 1s
Test Python 3.7 on ubuntu-22.04	53s
Test Python 3.9 on ubuntu-latest	49s
Test Python 3.10 on macos-latest	1m 4s
Test Python 3.12 on windows-latest	1m 28s
Test Python 3.10 on windows-latest	1m 29s
Test Python 3.7 on windows-latest	2m 21s
Test Python 3.11 on macos-latest	45s
Test Python 3.7 on macos-13	1m 22s
Test Python 3.9 on macos-latest	1m 27s
Test Python 3.10 on ubuntu-latest	52s
Build assets and deploy on tags	19s
	24m 11s

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