Update SLO report action to specific commit

Author: vgvoleg

.github/workflows/slo-report.yml

@@ -16,7 +16,7 @@ jobs:
     if: github.event.workflow_run.conclusion == 'success'
     steps:
       - name: Publish YDB SLO Report
-        uses: ydb-platform/ydb-slo-action/report@main
+        uses: ydb-platform/ydb-slo-action/report@53e02500d4a98a6b67d9009bc46e839236f15f81
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           github_run_id: ${{ github.event.workflow_run.id }}