Bump h11 from 0.14.0 to 0.16.0 in /src/backend #357

Job	Run time
Test ubuntu-latest Python 3.9	33s
Test ubuntu-latest Python 3.10	17s
Test ubuntu-latest Python 3.11	18s
Test ubuntu-latest Python 3.12	20s
Test macos-latest-xlarge Python 3.11	41s
Test macos-latest-xlarge Python 3.12	47s
Test macos-13 Python 3.9	34s
Test macos-13 Python 3.10	48s
Test macos-13 Python 3.11	33s
Test macos-13 Python 3.12	50s
Test windows-latest Python 3.9	3m 43s
Test windows-latest Python 3.10	3m 51s
Test windows-latest Python 3.11	2m 48s
Test windows-latest Python 3.12	3m 36s
	19m 39s

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