fix: upgrade @typespec/openapi3 from 0.56.0 to 0.57.0

Snyk has created this PR to upgrade @typespec/openapi3 from 0.56.0 to 0.57.0.

See this package in npm:
@typespec/openapi3

See this project in Snyk:
https://app.snyk.io/org/abdulrahman305/project/2d7e0832-afc9-498b-aaf9-735e1eddc8b5?utm_source=github&utm_medium=referral&page=upgrade-pr

sdk/ai/azopenaiassistants/testdata/package.json

@@ -10,7 +10,7 @@
     "@azure-tools/typespec-autorest": "^0.42.0",
     "@azure-tools/typespec-azure-core": "^0.42.0",
     "@typespec/compiler": "^0.56.0",
-    "@typespec/openapi3": "^0.56.0"
+    "@typespec/openapi3": "^0.57.0"
   },
   "private": true
 }