Remove race condition when creating new HTTPChannel #272

Job	Run time
Validate coverage	34s
Lint the package	28s
Build the documentation	20s
Python: 3.8-x64 on ubuntu-latest	36s
Python: 3.8-x64 on windows-latest	1m 10s
Python: 3.8-x86 on windows-latest	1m 20s
Python: 3.8-x64 on macos-latest	55s
Python: 3.9-x64 on ubuntu-latest	34s
Python: 3.9-x64 on windows-latest	1m 14s
Python: 3.9-x86 on windows-latest	1m 18s
Python: 3.9-x64 on macos-latest	42s
Python: 3.10-x64 on ubuntu-latest	29s
Python: 3.10-x64 on windows-latest	1m 0s
Python: 3.10-x86 on windows-latest	1m 22s
Python: 3.10-x64 on macos-latest	40s
Python: 3.11-x64 on ubuntu-latest	30s
Python: 3.11-x64 on windows-latest	1m 29s
Python: 3.11-x86 on windows-latest	1m 32s
Python: 3.11-x64 on macos-latest	43s
Python: 3.12-x64 on ubuntu-latest	32s
Python: 3.12-x64 on windows-latest	1m 13s
Python: 3.12-x86 on windows-latest	1m 37s
Python: 3.12-x64 on macos-latest	44s
Python: pypy-3.8-x64 on ubuntu-latest	47s
Python: pypy-3.9-x64 on ubuntu-latest	46s
Python: pypy-3.10-x64 on ubuntu-latest	53s
Python: pypy-3.10-x64 on windows-latest	1m 55s
Python: pypy-3.10-x86 on windows-latest	1m 58s
Python: pypy-3.10-x64 on macos-latest	53s
	28m 14s

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