Merge pull request #3964 from planetarium/prepare/5.4.0 · planetarium/libplanet@940e7a4

The following actions use a deprecated Node.js version and will be forced to run on node20: actions/setup-dotnet@v3. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

Converting null literal or possible null value to non-nullable type.

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Single-line comment should be preceded by blank line

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Single-line comment should be preceded by blank line

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