[sdk-breaking-change-labels] install runtime deps (#38899)

Author: mikeharder

.github/workflows/sdk-breaking-change-labels.yaml

@@ -39,6 +39,16 @@ jobs:
           ADO_TOKEN=$(az account get-access-token --resource "499b84ac-1321-427f-aa17-267ca6975798" --query "accessToken" -o tsv)
           echo "ADO_TOKEN=$ADO_TOKEN" >> "$GITHUB_ENV"
 
+      - name: Setup Node 20 and install deps
+        uses: ./.github/actions/setup-node-install-deps
+        with:
+          # actions/github-script@v7 uses Node 20
+          node-version: 20.x
+          # "--no-audit": improves performance
+          # "--omit dev": not needed at runtime, improves performance
+          install-command: "npm ci --no-audit --omit dev"
+          working-directory: ./.github
+
       - name: Get label and action
         id: get-label-and-action
         uses: actions/github-script@v7