Update node version on release config (#50)

Author: ooade

.github/workflows/publish-on-npm.yml

@@ -11,8 +11,8 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v1
         with:
-          node-version: 12
+          node-version: 14.17.6
       - run: yarn install --frozen-lockfile
       - run: npx semantic-release
         env:
-          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}