Remove race condition when creating new HTTPChannel #273

Job	Run time
Validate coverage	33s
Lint the package	26s
Build the documentation	19s
Python: 3.8-x64 on ubuntu-latest	29s
Python: 3.8-x64 on windows-latest	1m 7s
Python: 3.8-x86 on windows-latest	1m 20s
Python: 3.8-x64 on macos-latest	39s
Python: 3.9-x64 on ubuntu-latest	29s
Python: 3.9-x64 on windows-latest	1m 5s
Python: 3.9-x86 on windows-latest	1m 21s
Python: 3.9-x64 on macos-latest	40s
Python: 3.10-x64 on ubuntu-latest	30s
Python: 3.10-x64 on windows-latest	1m 13s
Python: 3.10-x86 on windows-latest	1m 27s
Python: 3.10-x64 on macos-latest	59s
Python: 3.11-x64 on ubuntu-latest	29s
Python: 3.11-x64 on windows-latest	1m 13s
Python: 3.11-x86 on windows-latest	1m 18s
Python: 3.11-x64 on macos-latest	38s
Python: 3.12-x64 on ubuntu-latest	33s
Python: 3.12-x64 on windows-latest	1m 24s
Python: 3.12-x86 on windows-latest	1m 31s
Python: 3.12-x64 on macos-latest	47s
Python: pypy-3.8-x64 on ubuntu-latest	48s
Python: pypy-3.9-x64 on ubuntu-latest	50s
Python: pypy-3.10-x64 on ubuntu-latest	49s
Python: pypy-3.10-x64 on windows-latest	1m 52s
Python: pypy-3.10-x86 on windows-latest	1m 52s
Python: pypy-3.10-x64 on macos-latest	52s
	27m 33s

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