Allow merging HeadersInit objects under new eslint rules

Using the spread operator on an array in an object will result in a list of indices  @typescript-eslint/no-misused-spread

fetch-json.ts

@@ -1,6 +1,6 @@
 // fetch-json ~ MIT License
 
-/* eslint-disable  @typescript-eslint/no-explicit-any */
+/* eslint-disable @typescript-eslint/no-explicit-any */
 export type Json =             string | number | boolean | null | undefined | JsonObject | Json[];
 export type JsonObject =       { [key: string]: Json };
 export type JsonData =         JsonObject | Json[];
@@ -57,7 +57,7 @@ const fetchJson = {
       const jsonHeaders: HeadersInit = { Accept: 'application/json' };
       if (!isGetRequest && data)
          jsonHeaders['Content-Type'] = 'application/json';
-      settings.headers = { ...jsonHeaders, ...settings.headers };
+      settings.headers = { ...jsonHeaders, ...settings.headers };  //eslint-disable-line @typescript-eslint/no-misused-spread
       const paramKeys =  isGetRequest && data ? Object.keys(data) : <string[]>[];
       const getValue =   (key: string) => data ? data[<keyof typeof data>key] : '';
       const toPair =     (key: string) => key + '=' + encodeURIComponent(getValue(key));  //build query string field-value

package.json

@@ -72,30 +72,30 @@
       "interactive": "http-server -o spec/fixtures/"
    },
    "devDependencies": {
-      "@eslint/js": "~9.11",
-      "@fortawesome/fontawesome-free": "~6.6",
-      "@types/node": "~22.7",
+      "@eslint/js": "~9.18",
+      "@fortawesome/fontawesome-free": "~6.7",
+      "@types/node": "~22.10",
       "add-dist-header": "~1.4",
       "assert-deep-strict-equal": "~1.2",
       "copy-file-util": "~1.2",
       "copy-folder-util": "~1.1",
       "dna-engine": "~3.2",
-      "eslint": "~9.11",
+      "eslint": "~9.18",
       "esm-to-plain-js": "~1.1",
       "http-server": "~14.1",
-      "jsdom": "~25.0",
+      "jsdom": "~26.0",
       "jshint": "~2.13",
-      "mocha": "~10.7",
-      "puppeteer": "~23.4",
+      "mocha": "~11.0",
+      "puppeteer": "~24.1",
       "puppeteer-browser-ready": "~1.3",
       "replacer-util": "~1.3",
       "rimraf": "~6.0",
       "run-scripts-util": "~1.3",
-      "typescript": "~5.6",
-      "typescript-eslint": "~8.7",
+      "typescript": "~5.7",
+      "typescript-eslint": "~8.20",
       "uglify-js": "~3.19",
       "w3c-html-validator": "~1.8",
-      "web-ignition": "~2.2",
+      "web-ignition": "~2.3",
       "whatwg-fetch": "~3.6"
    }
 }