test: validate README.md freeze guard (DO NOT MERGE) #674

Job	Run time
checks / pre-commit	48s
checks / readme-snippets	10s
checks / test (3.10, lowest-direct, ubuntu-latest)	52s
checks / test (3.10, locked, ubuntu-latest)	54s
checks / test (3.11, lowest-direct, ubuntu-latest)	55s
checks / test (3.11, locked, windows-latest)	2m 53s
checks / test (3.11, locked, ubuntu-latest)	52s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 2s
checks / test (3.12, lowest-direct, windows-latest)	3m 55s
checks / test (3.10, lowest-direct, windows-latest)	2m 7s
checks / test (3.14, locked, ubuntu-latest)	2m 18s
checks / test (3.12, locked, windows-latest)	3m 51s
checks / test (3.14, lowest-direct, windows-latest)	2m 18s
checks / test (3.13, locked, ubuntu-latest)	46s
checks / test (3.13, lowest-direct, ubuntu-latest)	54s
checks / test (3.13, locked, windows-latest)	2m 21s
checks / test (3.13, lowest-direct, windows-latest)	2m 31s
checks / test (3.12, locked, ubuntu-latest)	57s
checks / test (3.14, locked, windows-latest)	2m 51s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 17s
checks / test (3.10, locked, windows-latest)	2m 21s
checks / test (3.11, lowest-direct, windows-latest)	2m 34s
all-green	4s
	39m 31s

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