Bump gts from 5.3.1 to 6.0.2 in /samples/node-contract

Bumps [gts](https://github.com/google/gts) from 5.3.1 to 6.0.2.
- [Release notes](https://github.com/google/gts/releases)
- [Changelog](https://github.com/google/gts/blob/main/CHANGELOG.md)
- [Commits](google/gts@v5.3.1...v6.0.2)

---
updated-dependencies:
- dependency-name: gts
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

samples/node-contract/package-lock.json

@@ -25,7 +25,7 @@
   "license": "Apache-2.0",
   "devDependencies": {
     "@types/node": "^22.6.1",
-    "gts": "^5.3.1",
+    "gts": "^6.0.2",
     "typescript": "^5.6.2"
   },
   "dependencies": {