docs: list Python 3.14 in README badge #2127

Job	Run time
checks / readme-snippets	12s
checks / pre-commit	35s
checks / test (3.11, lowest-direct, ubuntu-latest)	54s
checks / test (3.10, locked, windows-latest)	3m 2s
checks / test (3.10, lowest-direct, ubuntu-latest)	55s
checks / test (3.10, locked, ubuntu-latest)	56s
checks / test (3.11, lowest-direct, windows-latest)	2m 55s
checks / test (3.10, lowest-direct, windows-latest)	2m 40s
checks / test (3.12, lowest-direct, windows-latest)	3m 51s
checks / test (3.12, lowest-direct, ubuntu-latest)	59s
checks / test (3.13, lowest-direct, windows-latest)	3m 7s
checks / test (3.14, locked, windows-latest)	2m 38s
checks / test (3.13, locked, ubuntu-latest)	50s
checks / test (3.12, locked, ubuntu-latest)	59s
checks / test (3.13, lowest-direct, ubuntu-latest)	56s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 20s
checks / test (3.11, locked, windows-latest)	2m 45s
checks / test (3.14, lowest-direct, windows-latest)	2m 13s
checks / test (3.11, locked, ubuntu-latest)	55s
checks / test (3.14, locked, ubuntu-latest)	2m 21s
checks / test (3.12, locked, windows-latest)	3m 43s
checks / test (3.13, locked, windows-latest)	2m 36s
all-green	4s
	41m 26s

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