Increase TaskTimeout in PipelineTaskTimout Test
Increase TaskTimeout in PipelineTaskTimout Test

Increase timeout to 60s from 20s. The first task in
this test pipeline takes more than 20s to start sometimes, making
the test flaky.

ref:
 - https://github.com/tektoncd/pipeline/pull/2118
 - https://github.com/tektoncd/pipeline/pull/2101
 - https://github.com/tektoncd/pipeline/pull/2092

Signed-off-by: Nikhil Thomas <06117e966d039194d106149e879b10e553143831@redhat.com>

tektoncd/pipeline,tektoncd/pipeline