Bump mio from 0.8.3 to 0.8.11 in /tensorboard/data/server #11463

Job	Run time
lint-frontend	1m 14s
lint-misc	13s
lint-python-flake8 (3.9)	17s
build-data-server-pip (native, ubuntu-20.04, 1.65.0)	4m 51s
lint-python-flake8 (3.10)	15s
lint-python-yaml-docs	28s
build-data-server-pip (native, macos-12, 1.65.0)	5m 43s
lint-python-flake8 (3.11)	12s
lint-rust (1.65.0, 0.16.1)	3m 54s
build-data-server-pip (universal, ubuntu-20.04, 1.65.0)	10s
build (tf, 3.9)	9m 24s
build (notf, 3.9)	5m 47s
	32m 28s

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