fix: bump node versions in workflows

Author: gr2m

lib/create-release-action.js

@@ -24,7 +24,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2
         with:
-          node-version: "12.x"
+          node-version: "lts/*"
       - uses: actions/cache@v1
         with:
           path: ~/.npm

lib/create-test-action.js

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node_version: ["12", "14"]
+        node_version: ["12", "14", "16"]
 
     steps:
       - uses: actions/checkout@v2

lib/create-update-prettier-action.js

@@ -18,7 +18,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2
         with:
-          version: 12
+          node-version: "lts/*"
       - uses: actions/cache@v1
         with:
           path: ~/.npm