ci: pick the docs-preview toolchain from the PR checkout #3432

Job	Run time
checks / readme-snippets	1m 29s
checks / pre-commit	1m 44s
checks / test (3.10, lowest-direct, windows-latest)	5m 20s
checks / test (3.10, locked, ubuntu-latest)	3m 46s
checks / test (3.10, locked, windows-latest)	3m 9s
checks / docs	2m 4s
checks / test (3.12, lowest-direct, windows-latest)	2m 43s
checks / test (3.10, lowest-direct, ubuntu-latest)	4m 11s
checks / test (3.14, lowest-direct, windows-latest)	3m 15s
checks / test (3.13, locked, windows-latest)	2m 33s
checks / test (3.11, lowest-direct, ubuntu-latest)	2m 25s
checks / test (3.12, locked, windows-latest)	2m 12s
checks / test (3.11, lowest-direct, windows-latest)	2m 27s
checks / test (3.11, locked, ubuntu-latest)	1m 21s
checks / test (3.13, locked, ubuntu-latest)	2m 30s
checks / test (3.14, lowest-direct, ubuntu-latest)	2m 57s
checks / test (3.13, lowest-direct, windows-latest)	3m 36s
checks / test (3.14, locked, ubuntu-latest)	2m 54s
checks / test (3.13, lowest-direct, ubuntu-latest)	3m 41s
checks / test (3.12, lowest-direct, ubuntu-latest)	4m 19s
checks / test (3.11, locked, windows-latest)	2m 30s
checks / test (3.12, locked, ubuntu-latest)	1m 59s
checks / test (3.14, locked, windows-latest)	2m 50s
all-green	1m 59s
	1h 7m 54s

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