Update serde_with requirement from 1.14.0 to 3.6.1 #667

Job	Run time
test-miri	2m 48s
Check doc	1m 9s
test (ubuntu-latest, x86_64-unknown-linux-gnu, stable)	1m 7s
test (macos-latest, x86_64-apple-darwin, stable)	2m 29s
test-cross (ubuntu-latest, powerpc-unknown-linux-gnu, stable)	1m 47s
test (windows-latest, x86_64-pc-windows-gnu, stable)	2m 12s
test-ios	28s
test (windows-latest, x86_64-pc-windows-msvc, beta)	2m 9s
test-no-std	16s
test (ubuntu-latest, x86_64-unknown-linux-gnu, MSRV, 1.60.0)	4m 18s
test (ubuntu-latest, sudo apt-get update ; sudo apt install gcc-multilib, i686-unknown-linux-gnu,...	42s
test (ubuntu-latest, x86_64-unknown-linux-gnu, nightly, minimal_versions)	33s
	19m 58s

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