Merge pull request #216 from mitodl/renovate/actions-setup-node-6.x

chore(deps): update actions/setup-node action to v6

Author: shaidar

.github/workflows/test-email-templates.yaml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
-      - uses: actions/setup-node@a0853c24544627f65ddf259abe73b1d18a591444 # v5
+      - uses: actions/setup-node@2028fbc5c25fe9cf00d9f06a71cc4710d4507903 # v6
         with:
           node-version: 24
       - name: Compile emails