feat: migrate base projet to eslint to v9.x flat config

eslint.config.js

@@ -1,9 +1,11 @@
-{
-    "extends": [
-        "./packages/eslint-config-base/index.js"
-    ],
-    "rules": {
-        // If your editor cannot show these to you, occasionally turn this off and run the linter
-        "no-warning-comments": 0
+const configBase = require('./packages/eslint-config-base/index.js');
+
+module.exports = [
+    ...configBase,
+    {
+        "rules": {
+            // If your editor cannot show these to you, occasionally turn this off and run the linter
+            "no-warning-comments": 0
+        }
     }
-}
+];

package.json

@@ -13,7 +13,7 @@
     "bugs": "https://github.com/eXolnet/code-quality-tools/issues",
     "devDependencies": {
         "babel-eslint": "^10.0.1",
-        "eslint": "^6.1.0"
+        "eslint": "^9.1.0"
     },
     "eslintIgnore": [
         "*/**/node_modules/*"