Bump major version to `v14.0.0` #1271

Job	Run time
🧬 Project metadata	16s
test-package-install (ubuntu-22.04-arm)	16s
test-package-install (windows-2022)	37s
test-package-install (ubuntu-24.04)	11s
test-package-install (windows-11-arm)	39s
test-package-install (ubuntu-22.04)	12s
test-package-install (macos-14)	15s
test-package-install (macos-26)	15s
test-package-install (macos-15)	19s
test-package-install (windows-2025)	40s
test-package-install (ubuntu-24.04-arm)	21s
test-package-install (macos-15-intel)	52s
test-package-install (ubuntu-slim)	15s
✅ macos-26 / py3.14	35s
✅ macos-26 / py3.10	36s
✅ ubuntu-slim / py3.14	1m 7s
✅ windows-2025 / py3.14	58s
✅ windows-2025 / py3.10	50s
✅ ubuntu-slim / py3.10	1m 45s
	10m 59s

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