test: increase upper bound in condvar_5
test: increase upper bound in condvar_5

Problem:
Upper bound on thread wakeup was set to 1.5 * (requested timeout).
On MacOS wakeup delay factors of 1.75 have been reported.

Solution:
Increase the bound to 5 * (requested timeout).

Refs: https://github.com/libuv/libuv/issues/1910
PR-URL: https://github.com/libuv/libuv/pull/1990
Reviewed-By: Anna Henningsen <2bc1ecb410e142bce83bce6f212b41e1781536dc@addaleax.net>
Reviewed-By: Colin Ihrig <838f779c91673db29b8572ea3f54d191d3878ae2@gmail.com>
Reviewed-By: Santiago Gimeno <3f17e29e343c4cf8809fb0970d81d6d8ee88d6b3@gmail.com>

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