package maintenance

- update to TS6
- replace ncc by rollup, which seems to now be the recommended workflow according to <https://github.com/actions/typescript-action>
- remove buildjet provider, as they are shutting down, see <https://buildjet.com/for-github-actions/blog/we-are-shutting-down>

tsconfig.json

@@ -2,20 +2,28 @@
   "compilerOptions": {
     "noEmitOnError": false,
     "diagnostics": true,
-    "lib": ["esnext"],
+    "lib": ["es2024"],
+    "types": ["node"],
 
-    "target": "es2020",
+    "target": "es2024",
 
     "resolveJsonModule": true,
+    "ignoreDeprecations": "6.0",
     "moduleResolution": "node",
     "module": "esnext",
     "esModuleInterop": true,
 
+    "incremental": true,
+    "tsBuildInfoFile": ".build/tsconfig.build.tsbuildinfo",
+
     "strict": true,
     "skipLibCheck": true,
     "noUnusedLocals": true,
     "noUnusedParameters": true,
-    "noImplicitReturns": true
+    "noImplicitReturns": true,
+
+    "outDir": ".build"
   },
+  "include": ["src", "rollup.config.ts"],
   "exclude": ["dist"]
 }