Remove setup-node step - not needed for built-in yaml module

Author: trask

.github/workflows/assign-issue-owners.yml

@@ -19,12 +19,6 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
 
-      - uses: actions/setup-node@2028fbc5c25fe9cf00d9f06a71cc4710d4507903 # v6.0.0
-        with:
-          cache: 'npm'
-          cache-dependency-path: |
-            .github/scripts/triage/package-lock.json
-
       - name: Parse component label and assign owners
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}