chore(deps): bump the agent group with 2 updates

Updates the requirements on [openai](https://github.com/openai/openai-node) and [tgrid](https://github.com/samchon/tgrid) to permit the latest version.

Updates `openai` to 6.15.0
- [Release notes](https://github.com/openai/openai-node/releases)
- [Changelog](https://github.com/openai/openai-node/blob/master/CHANGELOG.md)
- [Commits](openai/openai-node@v6.14.0...v6.15.0)

Updates `tgrid` to 1.2.1
- [Release notes](https://github.com/samchon/tgrid/releases)
- [Commits](samchon/tgrid@v1.2.0...v1.2.1)

---
updated-dependencies:
- dependency-name: openai
  dependency-version: 6.15.0
  dependency-type: direct:production
  dependency-group: agent
- dependency-name: tgrid
  dependency-version: 1.2.1
  dependency-type: direct:production
  dependency-group: agent
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -22,8 +22,8 @@
     "@samchon/openapi": "^5.1.0",
     "dotenv": "^16.4.7",
     "dotenv-expand": "^12.0.1",
-    "openai": "^6.14.0",
-    "tgrid": "^1.2.0",
+    "openai": "^6.15.0",
+    "tgrid": "^1.2.1",
     "tstl": "^3.0.0",
     "typia": "^10.1.0",
     "uuid": "^11.1.0"