build: bump typescript 5.9.3 -> ^6.0.3

TypeScript 6.0 changed the default `types` compiler option from
implicitly including every package under node_modules/@types to an
empty array, so the root tsconfig now explicitly opts into "node" to
keep ambient Node globals (Buffer, process) resolving for
playwright.config.ts and other node-context files reachable from the
default program.

@angular/build 21.2.x peer-depends on typescript <6.0, but
@angular/compiler-cli allows >=5.9 <6.1 and lint/typecheck/build all
pass clean under 6.0.3.

Author: quoberto

package-lock.json

@@ -65,7 +65,7 @@
     "jsdom": "^29.1.1",
     "jsonc-eslint-parser": "^3.1.0",
     "prettier": "^3.8.3",
-    "typescript": "5.9.3",
+    "typescript": "^6.0.3",
     "typescript-eslint": "^8.60.0",
     "vitest": "^4.1.7"
   },

package.json

@@ -3,6 +3,7 @@
   "compileOnSave": false,
   "compilerOptions": {
     "outDir": "./dist/out-tsc",
+    "types": ["node"],
     "resolveJsonModule": true,
     "esModuleInterop": true,
     "forceConsistentCasingInFileNames": true,