Bump serde from 1.0.206 to 1.0.208 #2726

Job	Run time
lint-crlf	8s
check-lockfile	5s
lint-newsfile	0s
changes	2s
lint-clippy	36s
check-sampleconfig	0s
lint	0s
check-schema-delta	0s
lint-clippy-nightly	44s
Typechecking	0s
lint-pydantic	0s
lint-readme	0s
lint-rustfmt	27s
linting-done	2s
calculate-test-jobs	5s
trial-olddeps	8m 29s
complement (monolith, SQLite)	12m 24s
portdb (3.8, 11)	3m 0s
complement (monolith, Postgres)	12m 57s
portdb (3.11, 15)	2m 55s
complement (workers, Postgres)	20m 36s
cargo-bench	0s
cargo-test	0s
trial-pypy	0s
trial (3.8, sqlite, all)	5m 44s
sytest (focal)	9m 12s
trial (3.8, postgres, 11, all)	13m 3s
sytest (focal, postgres)	10m 49s
trial (3.8, sqlite)	5m 50s
sytest (focal, multi-postgres, workers)	14m 15s
sytest (focal, multi-postgres, workers, asyncio)	20m 10s
export-data	2m 12s
tests-done	2s
	2h 23m 47s

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