chore(deps): update dependency docker/buildx to v0.20.1 #9814

Job	Run time
ci / revisions	1s
ci / buildx / Build, bleeding, linux/arm64	3m 53s
ci / build / Build, bleeding, linux/amd64	4m 16s
ci / Anchore Container Scan	4m 26s
ci / Trivy Container Scan	4m 55s
ci / Merge images, bleeding	3m 33s
ci / test-basic / Test container basic, bleeding	5m 48s
ci / test-novolume / Test container read-write, bleeding	3m 5s
ci / test-single-celery / Test container celery-single, bleeding	2m 28s
ci / test-localtime / Test container localtime, bleeding	2m 45s
ci / test-saml / Test container saml, bleeding	2m 46s
ci / test-split / Test container split, bleeding	2m 35s
ci / test-ssl / Test container basic, bleeding	2m 45s
ci / Tests, bleeding	1s
ci / Publish to Docker Hub, ${{ inputs.variant }}	0s
ci / Publish to GitHub, ${{ inputs.variant }}	0s
	43m 17s

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