ci: bump node version in release workflows to 16.x

Author: madsroskar

.github/workflows/next-release.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [14.x]
+        node-version: [16.x]
     steps:
       - uses: actions/checkout@v2
         with:

.github/workflows/release.yml

@@ -10,7 +10,7 @@ jobs:
    runs-on: ubuntu-latest
    strategy:
      matrix:
-       node-version: [12.x]
+       node-version: [16.x]
    steps:
      - uses: actions/checkout@v2
        with: