Update deploy-preview.yml

Upgrade node version to 20

Author: sserrata

.github/workflows/deploy-preview.yml

@@ -96,7 +96,7 @@ jobs:
       - name: Setup node
         uses: actions/setup-node@v4
         with:
-          node-version: "18"
+          node-version: "20"
           cache: "yarn"
 
       - name: Install dependencies
@@ -126,7 +126,7 @@ jobs:
       - name: Setup node
         uses: actions/setup-node@cdca7365b2dadb8aad0a33bc7601856ffabcc48e # v4
         with:
-          node-version: "18"
+          node-version: "20"
           cache: "yarn"
 
       - uses: actions/download-artifact@95815c38cf2ff2164869cbab79da8d1f422bc89e # v4