Upgrade node requirement to >=14

Author: jmsche

.github/workflows/high-depends.yml

@@ -14,7 +14,7 @@ jobs:
             fail-fast: false
             matrix:
                 os: [ubuntu-latest, windows-2019]
-                node-versions: [ '12', '16']
+                node-versions: ['14', '16']
 
         steps:
             -   name: Checkout

.github/workflows/low-depends.yml

@@ -14,7 +14,7 @@ jobs:
             fail-fast: false
             matrix:
                 os: [ubuntu-latest, windows-2019]
-                node-versions: [ '12', '16']
+                node-versions: ['14', '16']
 
         steps:
             -   name: Checkout

.github/workflows/stable-tests.yml

@@ -14,7 +14,7 @@ jobs:
             fail-fast: false
             matrix:
                 os: [ubuntu-latest, windows-2019]
-                node-versions: [ '12', '14', '16']
+                node-versions: ['14', '16']
 
         steps:
             -   name: Checkout

package.json

@@ -23,7 +23,7 @@
     "url": "https://github.com/symfony/webpack-encore/issues"
   },
   "engines": {
-    "node": "^12.13.0 || >=14.0.0"
+    "node": ">=14.0.0"
   },
   "homepage": "https://github.com/symfony/webpack-encore",
   "dependencies": {