Fix package.json

[msymt]

Hi. Fix invalid package.json by removing a trailing comma after the last property.

# Command Line
$ node -r ./tracer.js ./test.js 
node:internal/modules/package_json_reader:189
  const result = modulesBinding.readPackageJSON(nearestParentPackageJSON);
                                ^

Error: Invalid package config /Path/to/Nodejs-Tracer/package.json.
    at Object.getNearestParentPackageJSON (node:internal/modules/package_json_reader:189:33)
    at trySelf (node:internal/modules/cjs/loader:627:33)
    at Module._resolveFilename (node:internal/modules/cjs/loader:1396:24)
    at defaultResolveImpl (node:internal/modules/cjs/loader:1058:19)
    at resolveForCJSWithHooks (node:internal/modules/cjs/loader:1063:22)
    at Module._load (node:internal/modules/cjs/loader:1226:37)
    at TracingChannel.traceSync (node:diagnostics_channel:328:14)
    at wrapModuleLoad (node:internal/modules/cjs/loader:244:24)
    at Module.require (node:internal/modules/cjs/loader:1503:12)
    at node:internal/modules/cjs/loader:2046:12 {
  code: 'ERR_INVALID_PACKAGE_CONFIG'
}

Node.js v24.10.0