Increase datahub placeholders to 80
Increase datahub placeholders to 80

We wanna have one full node as headroom, so this would
help with that.

ryanlovett/datahub,ryanlovett/datahub,ryanlovett/datahub,berkeley-dsep-infra/datahub,berkeley-dsep-infra/datahub,berkeley-dsep-infra/datahub