ci: bump node-version in release workflow to v14

Following https://github.com/semantic-release/semantic-release/blob/685d2b5455bd55611e0581672a899631f06beb90/docs/support/node-version.md

.github/workflows/release.yml

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