Make the tests complete earlier.

[newacorn]

Reduce the test duration to 36% of the original time. Before Time Spend See Issue: https://github.com/valyala/fasthttp/issues/1839 After Commit:

~/GolandProjects/cbrotli_bug/fasthttp fasthttp_test_issue2*
❯ go test .
ok      github.com/valyala/fasthttp 2.558s

~/GolandProjects/cbrotli_bug/fasthttp fasthttp_test_issue2*
❯ go test -count=2
PASS
ok      github.com/valyala/fasthttp 4.976s

~/GolandProjects/cbrotli_bug/fasthttp fasthttp_test_issue2* 5s
❯ go test -count=3 .
ok      github.com/valyala/fasthttp 7.389s

~/GolandProjects/cbrotli_bug/fasthttp fasthttp_test_issue2* 8s
❯ go test -count=4 .
ok      github.com/valyala/fasthttp 9.991s

[erikdubbelboer]

Thanks!