fix(deps): Upgrade development dependencies (#110)

Ref: https://elijahmanor.com/byte/update-node-deps

Deps listed in https://github.com/adrienjoly/npm-pdfreader/security/dependabot:

<img width="955" alt="image" src="https://user-images.githubusercontent.com/531781/160157810-896829fd-8f2c-489c-855e-6a42fa9b2723.png">

Author: adrienjoly

.github/workflows/nodejs.yml

@@ -64,7 +64,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v1
         with:
-          node-version: 12
+          node-version: 14
       - name: Install dependencies
         run: npm ci
       - name: Release