test: update flakybot permissions (GoogleCloudPlatform#2389)

Author: JustinBeckwith

.github/workflows/healthcare-datasets.yaml

@@ -36,9 +36,8 @@ jobs:
  MOCHA_REPORTER_SUITENAME: healthcare_datasets
  MOCHA_REPORTER_OUTPUT: healthcare_datasets_sponge_log.xml
  MOCHA_REPORTER: xunit
- - run: echo ${{github.event_name}}
- - run: echo ${{github.event.action}}
  - if: ${{ github.event_name == 'schedule'}}
  run: |
  curl https://github.com/googleapis/repo-automation-bots/releases/download/flakybot-1.1.0/flakybot -o flakybot -s
+ chmod +x ./flakybot
  ./flakybot