Update npm dependencies, drop Node.js 14 support

* eslint 8.56.0 --> 8.57.0 (No longer supports Node.js 14)
* eslint-config-wikimedia 0.26.0 --> 0.27.0
* mocha 10.2.0 --> 10.4.0

Drop Node.js 14 support, and add support for Node.js 20.

Bug: https://phabricator.wikimedia.org/T360422

.github/workflows/node.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-v: [14.x, 16.x, 18.x]
+        node-v: [16.x, 18.x, 20.x]
     steps:
       - name: Checkout
         uses: actions/checkout@v2

package.json

@@ -22,9 +22,9 @@
   ],
   "main": "src/index.js",
   "devDependencies": {
-    "eslint": "8.56.0",
-    "eslint-config-wikimedia": "0.26.0",
-    "mocha": "10.2.0"
+    "eslint": "8.57.0",
+    "eslint-config-wikimedia": "0.27.0",
+    "mocha": "10.4.0"
   },
   "repository": {
     "type": "git",