Fix dispatching `static_route=None` on Windows #331

Job	Run time
Python 3.6 on ubuntu-20.04	32s
Python 3.7 on ubuntu-20.04	18s
Python 3.8 on ubuntu-20.04	17s
Python 3.9 on ubuntu-20.04	12s
Python 3.10 on ubuntu-20.04	15s
Python 3.11 on ubuntu-20.04	15s
Python 3.12 on ubuntu-20.04	20s
Python 3.13 on ubuntu-20.04	25s
Python pypy3.10 on ubuntu-20.04	49s
Python 3.6 on macos-12	1m 1s
Python 3.7 on macos-12	23s
Python 3.8 on macos-12	20s
Python 3.9 on macos-12	19s
Python 3.10 on macos-12	19s
Python 3.11 on macos-12	20s
Python 3.12 on macos-12	24s
Python 3.13 on macos-12	1m 2s
Python pypy3.10 on macos-12	47s
Python 3.8 on macos-latest	44s
Python 3.9 on macos-latest	16s
Python 3.10 on macos-latest	16s
Python 3.11 on macos-latest	21s
Python 3.12 on macos-latest	19s
Python 3.13 on macos-latest	16s
Python pypy3.10 on macos-latest	39s
Python 3.6 on windows-latest	1m 36s
Python 3.8 on windows-latest	38s
Python 3.9 on windows-latest	35s
Python 3.10 on windows-latest	27s
Python 3.11 on windows-latest	32s
Python 3.12 on windows-latest	42s
Python 3.13 on windows-latest	1m 20s
Python pypy3.10 on windows-latest	4m 51s
	21m 50s

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