fix: reduce granian backpressure #12258

Job	Run time
ci / revisions	3s
ci / build / Build, stable, amd64	4m 28s
ci / buildx / Build, stable, arm64	4m 28s
ci / Anchore Container Scan	2m 5s
ci / test-anubis / Test container anubis, stable	7m 37s
ci / test-basic / Test container basic, stable	7m 57s
ci / Trivy Container Scan	2m 12s
ci / test-novolume / Test container read-write, stable	7m 48s
ci / test-split / Test container split, stable	8m 14s
ci / test-ssl / Test container basic, stable	10m 24s
ci / test-saml / Test container saml, stable	7m 23s
ci / test-single-celery / Test container celery-single, stable	7m 38s
ci / test-localtime / Test container localtime, stable	7m 54s
ci / Merge images, stable	2m 6s
ci / Lint, stable	3s
ci / Tests, stable	2s
ci / Publish to GitHub, stable	2m 22s
ci / Publish to Docker Hub, stable	2m 11s
Create release on GitHub	0s
	1h 24m 55s

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