Downgrade ava to version 6.4.1

Since we run CI on Node 20 as well as Node 24

package.json

@@ -44,7 +44,7 @@
     "uuid": "^14.0.0"
   },
   "devDependencies": {
-    "@ava/typescript": "7.0.0",
+    "@ava/typescript": "6.0.0",
     "@eslint/compat": "^2.0.5",
     "@microsoft/eslint-formatter-sarif": "^3.1.0",
     "@octokit/types": "^16.0.0",
@@ -56,7 +56,7 @@
     "@types/sarif": "^2.1.7",
     "@types/semver": "^7.7.1",
     "@types/sinon": "^21.0.1",
-    "ava": "^7.0.0",
+    "ava": "^6.4.1",
     "esbuild": "^0.28.0",
     "eslint": "^9.39.4",
     "eslint-import-resolver-typescript": "^4.4.4",