Increase ram on meronense to 20GB

Lately seems like the update service for the metrics website has been generating oom errors on meronense and gets being killed by the kernel. At first I thought the cap on the ram usage was being ignored for some reason. So I lowered the ram cap and Java is indeed respecting that, but that value is now too low for the service to run and process the data. Some jobs end up running for too many days which ultimately means we aren't processing the data as we should.

I propose to increase the RAM on the VM. I know this might not be ideal, but I don't have another way to fix this at this point. Hopefully with metricsdb working correctly we will be able to migrate everything there soon.