Bump typescript from 4.7.3 to 5.9.3 in /src/microsoft-learn-mock

Bumps [typescript](https://github.com/microsoft/TypeScript) from 4.7.3 to 5.9.3.
- [Release notes](https://github.com/microsoft/TypeScript/releases)
- [Commits](microsoft/TypeScript@v4.7.3...v5.9.3)

---
updated-dependencies:
- dependency-name: typescript
  dependency-version: 5.9.3
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

src/microsoft-learn-mock/package-lock.json

@@ -15,7 +15,7 @@
     "@rollup/plugin-commonjs": "22.0.0",
     "@rollup/plugin-node-resolve": "13.3.0",
     "http-server": "14.1.1",
-    "typescript": "4.7.3",
+    "typescript": "5.9.3",
     "rollup": "2.75.6",
     "rollup-plugin-typescript2": "0.32.1"
   }