hdfs-hbase stack: Increase pvc size (#139)

## Description

When executing the hbase-hdfs demo on a non-kind cluster we have issues with storage. 
After setting org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicy = DEBUG we can see the actual error saying 
```2022-10-04 14:26:23,414 DEBUG blockmanagement.BlockPlacementPolicy: The node 10.104.0.29:9866 does not have enough DISK space (required=134217728, scheduled=1476395008, remaining=1482951146).```

Author: snocke

stacks/hdfs-hbase/hdfs.yaml

@@ -25,7 +25,7 @@ spec:
       resources:
         storage:
           data:
-            capacity: 2Gi
+            capacity: 5Gi
     roleGroups:
       default:
         replicas: 2
@@ -34,7 +34,7 @@ spec:
       resources:
         storage:
           data:
-            capacity: 2Gi
+            capacity: 5Gi
     roleGroups:
       default:
         replicas: 1
@@ -43,7 +43,7 @@ spec:
       resources:
         storage:
           data:
-            capacity: 2Gi
+            capacity: 5Gi
     roleGroups:
       default:
         replicas: 1