[examples] fix redwood template and update examples to use at least node@16 (#10395)

The redwood template was broken because it would use node@18, which is not supported for the version of redwood used in the template. This PR updates that version to be node@16, which does work.

While we're at it, I also updated other examples to be at least node@16. I tested deployments of each of these and the all work.

.changeset/stupid-paws-press.md

@@ -0,0 +1,5 @@
+---
+"examples": patch
+---
+
+update examples to use at least node@16

examples/polymer/package.json

@@ -30,6 +30,6 @@
     "wct-browser-legacy": "^1.0.0"
   },
   "engines": {
-    "node": ">=8.0"
+    "node": ">=16.0"
   }
 }

examples/redwoodjs/package.json

@@ -14,7 +14,7 @@
     "extends": "@redwoodjs/eslint-config"
   },
   "engines": {
-    "node": ">=12",
+    "node": "16.x",
     "yarn": ">=1.15"
   }
 }

examples/remix/package.json

@@ -27,6 +27,6 @@
     "typescript": "^5.1.3"
   },
   "engines": {
-    "node": ">=14"
+    "node": ">=16"
   }
 }

examples/umijs/package.json

@@ -46,6 +46,6 @@
     ]
   },
   "engines": {
-    "node": ">=8.0.0 <17"
+    "node": "16.x"
   }
 }

examples/vuepress/package.json

@@ -5,7 +5,7 @@
     "build": "vuepress build src"
   },
   "engines": {
-    "node": ">=14.0.0 <18.0.0"
+    "node": ">=16.0.0 <18.0.0"
   },
   "devDependencies": {
     "vuepress": "1.9.7"