chore: bumps ava to v6

- Move out ava config from package.json to ava.config.cjs

Author: saneef

ava.config.cjs

@@ -0,0 +1,6 @@
+module.exports = {
+  files: ["tests/**/*", "!tests/utils.js"],
+  watchMode: {
+    ignoreChanges: ["tests/output/**"],
+  },
+};

package.json

@@ -28,7 +28,7 @@
   "devDependencies": {
     "@eslint/eslintrc": "^3.3.3",
     "@eslint/js": "^9.39.2",
-    "ava": "^3.15.0",
+    "ava": "^6.4.1",
     "eslint": "^9.39.2",
     "eslint-config-prettier": "^10.1.8",
     "eslint-config-xo-space": "^0.35.0",
@@ -44,14 +44,5 @@
   "lint-staged": {
     "*.js": "eslint --cache --fix",
     "*.{js,md,json}": "prettier --write"
-  },
-  "ava": {
-    "files": [
-      "tests/**/*",
-      "!tests/utils.js"
-    ],
-    "ignoredByWatcher": [
-      "tests/output/**"
-    ]
   }
 }