build: update node version to stop aio from breaking while generating…

… docs (#42009)

When aio yarn docs-only command runs on v12.14.1 it fails details given on issue #41979. Upgrading node version to v12.17.0 solves this but creates a new warning (node:467072) ExperimentalWarning: The ESM module loader is experimental.
This warning gets removed in v12.20.0. Upgrading node version to 12.20.0

PR Close #42009

aio/package.json

@@ -79,7 +79,7 @@
   },
   "//engines-comment": "Keep this in sync with /package.json and /aio/tools/examples/shared/package.json",
   "engines": {
-    "node": "^12.14.1 || ^14.0.0",
+    "node": "^12.20.0 || ^14.0.0",
     "yarn": ">=1.22.4 <2",
     "npm": "Please use yarn instead of NPM to install dependencies"
   },

aio/tools/examples/shared/package.json

@@ -12,7 +12,7 @@
   },
   "//engines-comment": "Keep this in sync with /package.json and /aio/package.json",
   "engines": {
-    "node": "^12.14.1 || ^14.0.0",
+    "node": "^12.20.0 || ^14.0.0",
     "yarn": ">=1.21.1 <2",
     "npm": "Please use yarn instead of NPM to install dependencies"
   },

package.json

@@ -8,7 +8,7 @@
   "license": "MIT",
   "//engines-comment": "Keep this in sync with /aio/package.json and /aio/tools/examples/shared/package.json",
   "engines": {
-    "node": "^12.14.1 || ^14.0.0",
+    "node": "^12.20.0 || ^14.0.0",
     "yarn": ">=1.22.4 <2",
     "npm": "Please use yarn instead of NPM to install dependencies"
   },