fetch-and-ingest-gisaid: Bump memory to 90GiB

Yesterday's workflow ran into a MemoryError during transform-gisaid.¹
Bumping memory to 90GiB as an estimate to stay within the c5.12xlarge
EC2 instance's limit of 96GiB.²

¹ https://github.com/nextstrain/ncov-ingest/actions/runs/8913143774/job/24478083215#step:5:1641
² https://aws.amazon.com/ec2/instance-types/c5/

.github/workflows/fetch-and-ingest-gisaid-master.yml

@@ -101,7 +101,7 @@ jobs:
           --detach \
           --no-download \
           --cpus 16 \
-          --memory 68GiB \
+          --memory 90GiB \
           --env AWS_ACCESS_KEY_ID \
           --env AWS_SECRET_ACCESS_KEY \
           --env GISAID_API_ENDPOINT \