chore: update Node.js version and add npm install command in workflows

- Increase the Node.js version from '18' to '20' in the test.yml workflow
- Add npm install command in the client task in Taskfile.yml

Signed-off-by: ysicing <i@ysicing.me>

.github/workflows/test.yml

@@ -37,7 +37,7 @@ jobs:
           check-latest: true
       - uses: actions/setup-node@v4
         with:
-          node-version: '18'
+          node-version: '20'
       - name: install global dependencies
         run: |
           npm install -g yarn

Taskfile.yml

@@ -68,6 +68,7 @@ tasks:
     run: once
     dir: client
     cmds:
+      - npm install
       - npm run package-{{.GOOS}}-{{.GOARCH}}
 
   build_cli: