v1.18: update mio to 0.8.11 (backport of #60) #128

Job	Run time
cargo-test-sbf (token/program)	8m 58s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	13m 58s
check	0s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	9m 17s
cargo-test-sbf (token-upgrade/program)	9m 5s
cargo-test-sbf (feature-proposal/program)	8m 46s
test	0s
cargo-test-sbf (governance/addin-mock/program, governance/program)	12m 59s
cargo-test-sbf (memo/program)	8m 54s
cargo-test-sbf (name-service/program)	7m 54s
cargo-test-sbf (stake-pool/program)	12m 29s
cargo-test-sbf (single-pool/program)	8m 56s
	1h 41m 16s

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