use yarn 4

Author: karl-run

.github/workflows/main.yml

@@ -6,8 +6,11 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - run: yarn
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: '20'
+      - run: yarn --immutable
       - run: yarn test
       - uses: devmasx/[email protected]
         with:

.yarn/install-state.gz

@@ -0,0 +1 @@
+nodeLinker: node-modules

.yarnrc.yml

@@ -72,5 +72,6 @@
     "react-dom": "^18.2.0",
     "react-scripts": "^5.0.1",
     "react-test-renderer": "^18.0.2"
-  }
+  },
+  "packageManager": "[email protected]"
 }