chore(deps): update dependency docker/buildx to v0.20.1 (#2964) #9580

Job	Run time
ci / revisions	2s
ci / build / Build, stable, linux/amd64	15s
ci / buildx / Build, stable, linux/arm64	2m 19s
ci / Trivy Container Scan	2m 55s
ci / Anchore Container Scan	1m 43s
ci / test-basic / Test container basic, stable	2m 44s
ci / Merge images, stable	25s
ci / test-novolume / Test container read-write, stable	5m 34s
ci / test-split / Test container split, stable	6m 12s
ci / test-saml / Test container saml, stable	12m 33s
ci / test-localtime / Test container localtime, stable	8m 11s
ci / test-single-celery / Test container celery-single, stable	9m 34s
ci / test-ssl / Test container basic, stable	8m 3s
ci / Tests, stable	1s
ci / Publish to GitHub, stable	1m 47s
ci / Publish to Docker Hub, stable	1m 49s
Create release on GitHub	0s
	1h 4m 7s

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