Update typescript-eslint monorepo to v6.20.0

Author: renovate[bot]

package-lock.json

@@ -66,8 +66,8 @@
     "@types/qunit": "2.19.10",
     "@types/rsvp": "4.0.9",
     "@types/sjcl": "1.0.34",
-    "@typescript-eslint/eslint-plugin": "6.19.1",
-    "@typescript-eslint/parser": "6.19.1",
+    "@typescript-eslint/eslint-plugin": "6.20.0",
+    "@typescript-eslint/parser": "6.20.0",
     "bootstrap": "4.6.2",
     "broccoli-asset-rev": "3.0.0",
     "concurrently": "8.2.2",