Bump TestSidecarTaskSupport test timeout to 2m.
Bump TestSidecarTaskSupport test timeout to 2m.

The sidecar tests have been fairly flaky. :(
While in upstream we've added more compute at the prow clusters to
help, this has still been noticable in other CI environments.

Bumping this for the time being to help the pain. It'd probably be worth
looking into if there's room for improvement for why these are taking so
long to schedule.

tektoncd/pipeline,tektoncd/pipeline