MDL-72623 nodejs: Bump from v14.15.0 to v14.18.0

Without modifying any installed package or dependency
because, after trying to do so, the updated stuff is huge
and leads to some JS validation / minimisation problems.

.nvmrc

@@ -1 +1 @@
-v14.15.0
+v14.18.0

package.json

@@ -43,6 +43,6 @@
     "xpath": "0.0.27"
   },
   "engines": {
-    "node": ">=14.15.0 <15"
+    "node": ">=14.18.0 <15"
   }
 }