add a linkcheck timeout #555

Job	Run time
Linux docs	1m 10s
Python 3.7 on macos-13	2m 35s
Linux meta	1m 7s
Python 3.7 on Windows x86	2m 51s
Python 3.13-dev on macos-13	3m 9s
Linux mypy	1m 0s
Python 3.13-dev (minimal build) on macos-13	4m 52s
Python 3.8 on Windows x86	2m 43s
Linux pypy3	2m 38s
Python 3.13-dev on macos-latest	2m 10s
Python 3.9 on Windows x86	2m 56s
Linux pypy3	2m 33s
Python 3.13-dev (minimal build) on macos-latest	1m 31s
Python 3.10 on Windows x86	3m 15s
Linux py37	1m 47s
Python 3.11 on Windows x86	2m 30s
Linux py38	1m 42s
Python 3.12 on Windows x86	2m 47s
Linux py39	1m 44s
Python 3.13-dev on Windows x86	3m 8s
Linux py310	1m 45s
Python 3.7 on Windows x64	2m 16s
Linux py311	1m 44s
Python 3.8 on Windows x64	2m 1s
Linux py312	1m 49s
Python 3.9 on Windows x64	1m 54s
Linux py313	1m 55s
Python 3.10 on Windows x64	1m 58s
Linux py313 system	2m 34s
Python 3.11 on Windows x64	2m 1s
Linux py313 minimal	1m 54s
Python 3.12 on Windows x64	1m 57s
Python 3.13-dev on Windows x64	2m 46s
	1h 14m 42s

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