`POST /eth/v2/beacon/pool/attestations` bugfixes (#6867) #1796

Job	Run time
extract-version	1s
build-docker-lighthouse-aarch64	25m 19s
build-docker-lighthouse-x86_64	22m 49s
build-docker-lcli-aarch64	7m 32s
build-docker-lcli-x86_64	7m 13s
build-docker-lighthouse-multiarch	13s
build-docker-lcli-multiarch	11s
	1h 3m 18s

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