Fix occasional seed test failures

[irar2]

From time to time we get this kind of failure:

Summarizing 2 Failures:
  [FAIL] Simulator with seed text completions with the same seed [It] second time text completion with seed
  /Users/irar/workspace/llmd/irar2-llm-d-inference-sim/pkg/llm-d-inference-sim/seed_test.go:50
  [FAIL] Simulator with seed text completions with the same seed [It] fifth time text completion with seed
  /Users/irar/workspace/llmd/irar2-llm-d-inference-sim/pkg/llm-d-inference-sim/seed_test.go:50