MINOR: [C++] Include `<string>` before using `std::string` (#42004) · apache/arrow@a708fab

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/upload-artifact@v3. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

Failed to save: "C:\Program failed with error: The process 'C:\Program Files\Git\usr\bin\tar.exe' failed with exit code 2

The following artifacts were uploaded using a version of actions/upload-artifact that is scheduled for deprecation: "libarrow-rtools40-ucrt64.zip", "test-output". Please update your workflow to use v4 of the artifact actions. Learn more: https://github.blog/changelog/2024-04-16-deprecation-notice-v3-of-the-artifact-actions/

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