Fix occasionally failing concurrency limiter test
Fix for failing test:
--- FAIL: TestLimiter (0.99s)
--- FAIL: TestLimiter/wide-spread (0.34s)
assertions.go:226:
Error Trace: concurrency_limiter_test.go:164
Error: Should be true
Messages: Expected maximum concurrency to be in the range [80,102] but got 69
FAIL