Flaky plutus-merkle-tree test

[ffakenz]

Last seen in CI run https://github.com/input-output-hk/hydra-poc/actions/runs/3477337017/jobs/5813391414 on https://github.com/input-output-hk/hydra-poc//commits/59936b0fb9b96f19e395aa6a7c0e3b4167008aa4

Test suite unit: RUNNING...

Plutus.MerkleTree
  fromList . toList roundtrips MT
    +++ OK, passed 100 tests.
  can check membership of an element
    +++ OK, passed 100 tests; 13 discarded.
  tree is balanced FAILED [1]

Failures:

  test/Plutus/MerkleTreeSpec.hs:30:3: 
  1) Plutus.MerkleTree tree is balanced
       *** Gave up! Passed only 399 tests; 72 discarded tests (100.0% proofs are in log(n) size of tree).

  To rerun use: --match "/Plutus.MerkleTree/tree is balanced/"

Randomized with seed 1850098941

Finished in 0.1014 seconds
3 examples, 1 failure
Test suite unit: FAIL