time: TestReset failures

[gopherbot]

#!watchflakes
default <- pkg == "time" && test == "TestReset"

Issue created automatically to collect these failures.

Example (log):

--- FAIL: TestReset (2.58s)
    sleep_test.go:436: resetting unfired timer returned false

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "time" && test == "TestReset"

2023-06-08 17:09 linux-s390x-ibm go@bff4b0ed time.TestReset (log)

--- FAIL: TestReset (2.58s)
    sleep_test.go:436: resetting unfired timer returned false

2023-06-09 00:01 linux-s390x-ibm go@ce8eadf5 time.TestReset (log)

--- FAIL: TestReset (2.37s)
    sleep_test.go:436: resetting unfired timer returned false

— watchflakes

[bcmills]

This test has a hard-coded upper bound on the timeout that tops out at about ⅓ s.
https://cs.opensource.google/go/go/+/master:src/time/sleep_test.go;l=418-427;drc=af7f417665fb1612eb9865c7ab4992bf095148e2

The fix is presumably to increase that timeout to a number that is more reasonable on a heavily-loaded machine.

[gopherbot]

Change https://go.dev/cl/508695 mentions this issue: time: increase arbitrary upper bound in TestReset to 10s