[FLINK-28005][tests] Reduce network memory in UnalignedCheckpointTestBase #19954
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Sets the network memory to 32mb (down from 64mb), halving the memory usage. Some tests spawn a large number of task managers (up to 25) eating up the majority of the memory budged with network buffers.
I had a successful run with 12mb, so I figured 32mb should be sufficient.