docs: pin mkdocs<2 and silence the mkdocs-material advisory banner in… #3408

Job	Run time
checks / docs	45s
checks / pre-commit	52s
checks / test (3.11, locked, ubuntu-latest)	1m 20s
checks / test (3.11, lowest-direct, windows-latest)	2m 3s
checks / test (3.10, locked, ubuntu-latest)	1m 25s
checks / test (3.12, locked, windows-latest)	1m 51s
checks / test (3.12, lowest-direct, windows-latest)	1m 56s
checks / test (3.12, locked, ubuntu-latest)	1m 36s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 21s
checks / test (3.10, lowest-direct, windows-latest)	1m 48s
checks / readme-snippets	16s
checks / test (3.11, locked, windows-latest)	1m 59s
checks / test (3.13, lowest-direct, windows-latest)	1m 56s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 31s
checks / test (3.10, locked, windows-latest)	1m 39s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 16s
checks / test (3.14, lowest-direct, windows-latest)	1m 42s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 16s
checks / test (3.13, locked, windows-latest)	1m 50s
checks / test (3.13, locked, ubuntu-latest)	1m 10s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 25s
checks / test (3.14, locked, windows-latest)	2m 32s
checks / test (3.14, locked, ubuntu-latest)	2m 20s
all-green	3s
	35m 52s

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