update maxSize from 5 to 10 for 4.21 hive pool

[kannon92]

This matches the other pools. Not sure why it was set to 5 in the first place.

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[danilo-gemoli]

@deepsm007 any reason why we have 5 here? It's not always 10 though, see clusters/hosted-mgmt/hive/pools/openshift-ci/ci-ocp-4-19-0-arm64-aws-us-east-1_clusterpool.yaml