Update npm package llamaindex to v0.12.1

Author: hash-worker[bot]

apps/hash-ai-worker-ts/package.json

@@ -73,7 +73,7 @@
     "gpt-tokenizer": "3.2.0",
     "is-docker": "3.0.0",
     "jsdom": "24.1.3",
-    "llamaindex": "0.8.37",
+    "llamaindex": "0.12.1",
     "lodash": "4.17.21",
     "md5": "2.3.0",
     "mime-types": "2.1.35",