Flaky Test TestCache_diskCleanup

https://gitlab.com/gitlab-org/gitaly/-/jobs/1657538263

=== RUN   TestCache_diskCleanup
    cache_test.go:259: 
        	Error Trace:	cache_test.go:128
        	            				cache_test.go:259
        	Error:      	Not equal: 
        	            	expected: 0
        	            	actual  : 1
        	Test:       	TestCache_diskCleanup
        	Messages:   	unexpected find output "/tmp/gitaly-1978787941/4093863139/01/db0e947f17533aa9bbd3-1\n"
--- FAIL: TestCache_diskCleanup (0.09s)

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