MINOR: quic: Move code to wakeup the timer task to avoid anti-amplication deadlock

MINOR: quic: Move code to wakeup the timer task to avoid anti-amplication deadlock

This code was there because the timer task was not running on the same thread
as the one which parse the QUIC packets. Now that this is no more the case,
we can wake up this task directly.

Must be backported to 2.7.