fix(deps): update rust crate serde to v1.0.209 #27

Job	Run time
release / Configure compilation targets	3s
release / get-next-version / Get next release version	12s
release / Test aarch64-unknown-linux-gnu	2m 35s
release / Test aarch64-unknown-linux-musl	3m 22s
release / Test i686-unknown-linux-gnu	1m 32s
release / Test i686-unknown-linux-musl	1m 31s
release / Test x86_64-apple-darwin	41s
release / Test x86_64-unknown-linux-gnu	41s
release / Test x86_64-unknown-linux-musl	56s
release / (swiss-qr-bill-decoder, aarch64-apple-darwin)	2m 35s
release / (swiss-qr-bill-decoder, aarch64-unknown-linux-gnu)	1m 48s
release / (swiss-qr-bill-decoder, aarch64-unknown-linux-musl)	1m 51s
release / (swiss-qr-bill-decoder, i686-unknown-linux-gnu)	2m 1s
release / (swiss-qr-bill-decoder, i686-unknown-linux-musl)	1m 57s
release / (swiss-qr-bill-decoder, x86_64-apple-darwin)	55s
release / (swiss-qr-bill-decoder, x86_64-unknown-linux-gnu)	43s
release / (swiss-qr-bill-decoder, x86_64-unknown-linux-musl)	1m 30s
release / Release	40s
	25m 33s

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