update node version used in build and deploy workflow

Summary:
Use node version 20 to fix IDB website failing to deploy on `yarn install` step:

```
error [email protected]: The engine "node" is incompatible with this module. Expected version ">=20". Got "16.14.0"
```
https://github.com/facebook/idb/actions/runs/13181600959/job/36793530892

Differential Revision: D69246989

fbshipit-source-id: e8c1f85bfe6cd00ec8650c8414420d1dc85c211b

Author: Carlos Gomez

.github/workflows/build_and_deploy.yml

@@ -10,7 +10,7 @@ jobs:
     - uses: actions/[email protected]
     - uses: actions/setup-node@v4
       with:
-        node-version: 16.14.0
+        node-version: 20
     - name: Deploying to GitHub Pages
       run: |
         git config --global user.email "[email protected]"