Bump h11 from 0.14.0 to 0.16.0 in /src/backend #398

Job	Run time
Test ubuntu-latest Python 3.10	20s
Test ubuntu-latest Python 3.12	21s
Test ubuntu-latest Python 3.9	20s
Test macos-latest-xlarge Python 3.12	45s
Test macos-latest-xlarge Python 3.11	43s
Test ubuntu-latest Python 3.11	21s
Test macos-13 Python 3.9	38s
Test windows-latest Python 3.9	3m 31s
Test macos-13 Python 3.11	35s
Test macos-13 Python 3.10	37s
Test windows-latest Python 3.12	4m 16s
Test macos-13 Python 3.12	38s
Test windows-latest Python 3.10	4m 0s
Test windows-latest Python 3.11	4m 9s
	21m 14s

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