Fix some mod compatibility issues · rwmt/Multiplayer@20068a8

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/upload-artifact@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

The process '/usr/bin/git' failed with exit code 128

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Non-nullable field 'info' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

Non-nullable field 'error' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

Possible null reference return.

Cannot convert null literal to non-nullable reference type.

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

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