build_plan: Update sample input.json.

Sample input.json had a dated version of builder configs and was not
able to be read by build_plan_generator. This change updates the builder
configs to use the current format.

BUG=None
TEST=Local call to build_plan_generator.go using sample data.

Change-Id: I78d69ef62b93cb72baf521f337555bd6e670efc2
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/go/+/2291831
Commit-Queue: Navil Perez <navil@google.com>
Tested-by: Navil Perez <navil@google.com>
Auto-Submit: Navil Perez <navil@google.com>
Reviewed-by: Sean Abraham <seanabraham@chromium.org>
1 file changed