Gardening action: enable new board automation task (#7412)

.github/workflows/gardening.yml

@@ -42,4 +42,6 @@ jobs:
          slack_team_channel: ${{ secrets.SLACK_TEAM_CHANNEL }}
          slack_he_triage_channel: ${{ secrets.SLACK_HE_TRIAGE_CHANNEL }}
          slack_quality_channel: ${{ secrets.SLACK_QUALITY_CHANNEL }}
-         tasks: 'cleanLabels,flagOss,triageIssues,gatherSupportReferences,replyToCustomersReminder'
+         triage_projects_token: ${{ secrets.PROJECT_AUTOMATION_TOKEN }}
+         project_board_url: ${{ secrets.PROJECT_BOARD_URL }}
+         tasks: 'cleanLabels,flagOss,triageIssues,gatherSupportReferences,replyToCustomersReminder,updateBoard'