chore: update CI configuration to use Node.js 20.x and switch to yarn for dependency management

Author: Coderrob

.github/workflows/ci.yml

@@ -12,23 +12,26 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [18.x]
+        node-version: [20.x]
 
     steps:
       - uses: actions/checkout@v4
+
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node-version }}
+          cache: "yarn"
+
       - name: Install dependencies
-        run: |
-          npm ci
+        run: yarn install --frozen-lockfile
+
       - name: Lint
-        run: |
-          npm run lint
+        run: yarn lint
+
       - name: Test
-        run: |
-          npm test
+        run: yarn test
+
       - name: Upload coverage
         if: success()
         uses: actions/upload-artifact@v4