Increase linter timeout to 5m
Increase linter timeout to 5m

Temporary fix for intermittent build timeouts.
Full fix coming soon via plumbing#241

Signed-off-by: Dibyo Mukherjee <7d445be0c0af41c00c371a1f7b3669c3331901f5@google.com>

tektoncd/triggers,tektoncd/triggers