build(deps-dev): bump typescript from 5.9.3 to 6.0.3 (#1093)

* build(deps-dev): bump typescript from 5.9.3 to 6.0.3

Bumps [typescript](https://github.com/microsoft/TypeScript) from 5.9.3 to 6.0.3.
- [Release notes](https://github.com/microsoft/TypeScript/releases)
- [Commits](microsoft/TypeScript@v5.9.3...v6.0.3)

---
updated-dependencies:
- dependency-name: typescript
  dependency-version: 6.0.3
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

* fix: restore lib and types defaults for TypeScript 6.0

TypeScript 6.0 narrowed the default `lib` and stopped auto-including
`@types/*` packages globally, breaking the build (flatMap and mocha/node
globals). Pin them explicitly in tsconfig.

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Thomas Poignant <thomas.poignant@gmail.com>
Co-authored-by: Thomas Poignant <thomas.poignant@gofeatureflag.org>

Author: dependabot[bot]

package-lock.json

@@ -38,7 +38,7 @@
     "mocha": "^11.7.5",
     "nyc": "18.0.0",
     "ts-node": "10.9.2",
-    "typescript": "5.9.3"
+    "typescript": "6.0.3"
   },
   "dependencies": {
     "@types/node": "^26.0.0",

package.json

@@ -8,6 +8,8 @@
     "sourceMap": true,
     "strict": true,
     "target": "es2017",
+    "lib": ["es2019"],
+    "types": ["mocha", "node"],
     "incremental": true,
     "allowJs": false
   },