Bump h11 from 0.14.0 to 0.16.0 in /src/backend #377

Job	Run time
Test ubuntu-latest Python 3.9	18s
Test ubuntu-latest Python 3.10	53s
Test ubuntu-latest Python 3.11	19s
Test ubuntu-latest Python 3.12	24s
Test macos-latest-xlarge Python 3.11	46s
Test macos-latest-xlarge Python 3.12	45s
Test macos-13 Python 3.9	40s
Test macos-13 Python 3.10	36s
Test macos-13 Python 3.11	38s
Test macos-13 Python 3.12	50s
Test windows-latest Python 3.9	4m 11s
Test windows-latest Python 3.10	3m 26s
Test windows-latest Python 3.11	6m 46s
Test windows-latest Python 3.12	4m 7s
	24m 39s

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