Add a short sleep if the request is rate-limited #1283

Job	Run time
lint-crlf	10s
check-lockfile	15s
changes	2s
lint-newsfile	30s
check-sampleconfig	44s
check-schema-delta	37s
lint-clippy	0s
lint	45s
Typechecking	1m 37s
lint-clippy-nightly	0s
lint-pydantic	42s
lint-rustfmt	0s
linting-done	2s
calculate-test-jobs	11s
cargo-bench	0s
complement (monolith, SQLite)	12m 8s
cargo-test	0s
complement (monolith, Postgres)	13m 14s
portdb (3.8, 11)	2m 47s
trial-olddeps	6m 43s
complement (workers, Postgres)	20m 32s
portdb (3.11, 15)	3m 4s
trial-pypy	0s
sytest (focal)	8m 56s
trial (3.8, sqlite, all)	4m 15s
sytest (focal, postgres)	10m 12s
trial (3.8, postgres, 11, all)	10m 22s
sytest (focal, multi-postgres, workers)	13m 42s
sytest (focal, multi-postgres, workers, asyncio)	19m 45s
trial (3.8, sqlite)	3m 55s
export-data	2m 9s
tests-done	2s
	2h 17m 21s

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