Increase stress test metaspace size because of the increased AA requirements #4075
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Looks like after the last updates of AA in #4058 and/or #4052 AA requires a bit more meatspace memory and so our stress-test fails with K2 (one, two)
I've checked this test memory usage locally with K2, and I don't see any real problem with metaspace leaks.
Below are the graphs of non-heap memory usage of the test:
Before #4052 (29849df):

Before #4058 (908a445):

master (3b20e70) (TEST FAILED BECAUSE OF OOM: METASPACE):

with this PR and increased metaspace size:
