Allow npm 11 alongside npm 10

Node 24 ships npm 11, which the previous `^10.9.8` range rejected with
an EBADENGINE warning.

package-lock.json

@@ -16,7 +16,7 @@
       },
       "engines": {
         "node": "^22.22.3 || ^24.15.0",
-        "npm": "^10.9.8"
+        "npm": "^10.9.8 || ^11.0.0"
       }
     },
     "node_modules/@babel/code-frame": {

package.json

@@ -11,7 +11,7 @@
   "private": true,
   "engines": {
     "node": "^22.22.3 || ^24.15.0",
-    "npm": "^10.9.8"
+    "npm": "^10.9.8 || ^11.0.0"
   },
   "devDependencies": {
     "@redocly/cli": "^2.17.0"