Update dependency @sindresorhus/tsconfig to v8 (#72)

Author: renovate[bot]

package.json

@@ -22,7 +22,7 @@
     "prepublishOnly": "npm run -s build"
   },
   "devDependencies": {
-    "@sindresorhus/tsconfig": "7.0.0",
+    "@sindresorhus/tsconfig": "8.0.0",
     "prettier": "3.6.2",
     "typescript": "5.9.2"
   },