build(release.yml): set node-version to 16

Author: gr2m

.github/workflows/release.yml

@@ -1,12 +1,11 @@
 name: Release
-on:
+"on":
   push:
     branches:
       - master
       - next
       - beta
-      - "*.x" # maintenance releases such as 15.x
-
+      - "*.x"
 jobs:
   release:
     name: release
@@ -15,7 +14,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2
         with:
-          node-version: 12
+          node-version: 16
           cache: npm
       - run: npm ci
       - run: npm run build --if-present