use node 20 via actions/setup-node

.github/workflows/storybook.yml

@@ -18,11 +18,7 @@ concurrency:
 
 jobs:
     build:
-        runs-on: ${{ matrix.os }}
-        strategy:
-            matrix:
-                os: [ubuntu-latest]
-                node-version: [20.x]
+        runs-on: ubuntu-latest
         steps:
             # chromaui/@action doesn't work with shallow checkouts which is the
             # default for actions/checkout so we need to force it to checkout
@@ -31,6 +27,11 @@ jobs:
               with:
                   fetch-depth: 0
 
+            - name: Use Node.js 20.x
+                uses: actions/setup-node@v4
+                with:
+                    node-version: 20.x
+
             - name: Get yarn cache
               id: yarn-cache
               run: echo "::set-output name=dir::$(yarn cache dir)"