logging: increase timeout
logging: increase timeout

Attempt to decrease the flakiness of the test.

Change-Id: Ic7f25dfa6626eb8110d091e005c6ee4f17a50f00
Reviewed-on: https://code-review.googlesource.com/8271
Reviewed-by: Sarah Adams <2b342d1c32491b4e7587e4a0e291a5f0f95d4167@google.com>

googleapis/google-cloud-go,michael-grosshans/google-cloud-go,googleapis/google-cloud-go,googleapis/google-cloud-go,googleapis/google-cloud-go,michael-grosshans/google-cloud-go