build(deps): bump serde from 1.0.188 to 1.0.189 #2287

Job	Run time
Lints, pinned toolchain (x86_64)	2m 0s
Lints, pinned toolchain (s390x)	14m 39s
Tests, minimum supported toolchain (x86_64)	3m 59s
Tests, stable toolchain (x86_64)	4m 47s
Tests, minimum supported toolchain (s390x)	28m 41s
Tests, stable toolchain (s390x)	26m 38s
Docs	3m 10s
Tests, unstable toolchain (beta, x86_64)	4m 52s
Tests, unstable toolchain (nightly, x86_64)	5m 1s
	1h 33m 47s

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