[v1.x] Support Python 3.14 #4286

Job	Run time
checks / pre-commit	30s
checks / doc-snippets	14s
checks / test (3.10, highest, windows-latest)	3m 4s
checks / test (3.11, lowest-direct, ubuntu-latest)	47s
checks / test (3.12, highest, ubuntu-latest)	44s
checks / test (3.11, lowest-direct, windows-latest)	2m 12s
checks / test (3.10, lowest-direct, windows-latest)	1m 25s
checks / test (3.10, highest, ubuntu-latest)	46s
checks / test (3.11, highest, windows-latest)	2m 1s
checks / test (3.12, lowest-direct, windows-latest)	3m 5s
checks / test (3.10, lowest-direct, ubuntu-latest)	44s
checks / test (3.12, lowest-direct, ubuntu-latest)	50s
checks / test (3.13, highest, ubuntu-latest)	41s
checks / test (3.11, highest, ubuntu-latest)	43s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 3s
checks / test (3.14, lowest-direct, windows-latest)	2m 39s
checks / test (3.14, highest, windows-latest)	2m 17s
checks / test (3.13, lowest-direct, windows-latest)	2m 11s
checks / test (3.14, highest, ubuntu-latest)	52s
checks / test (3.12, highest, windows-latest)	2m 44s
checks / test (3.13, lowest-direct, ubuntu-latest)	46s
checks / test (3.13, highest, windows-latest)	2m 56s
all-green	4s
	33m 18s

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