Job Failed #482268050: Flaky Go unit test "TestLimiter/wide-spread"

Job #482268050 failed for d93d19c1:

The TestLimiter/wide-spread unit test appears to fail when run with the race detector:

--- FAIL: TestLimiter (6.49s)
     --- FAIL: TestLimiter/wide-spread (5.84s)
         concurrency_limiter_test.go:174: 
             	Error Trace:	concurrency_limiter_test.go:174
             	Error:      	Should be true
             	Test:       	TestLimiter/wide-spread
             	Messages:   	Expected maximum concurrency to be in the range [95,105] but got 88
 FAIL
 FAIL	gitlab.com/gitlab-org/gitaly/internal/middleware/limithandler	7.188s

The test appears to have indeterministic results, that is mitigated by allowing for a range of values. Sometimes this range is not satisfied in CI.

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