chore: Node.js 16 actions are deprecated (#273)

* chore: Node.js 16 actions are deprecated

- Please update the following actions to use Node.js 20: actions/checkout@v3, actions/cache@v3, actions/setup-node@v3.
- For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

* chore: Remove Travis CI config

.github/workflows/test.yml

@@ -12,14 +12,14 @@ jobs:
     name: Test
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup Node.js and Yarn
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v4
         with:
           node-version: '18'
 
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         id: cache
         with:
           path: '**/node_modules'