Fix 2-player mode · Renzo904/TekaTeka@33bd3e9

ubuntu-latest pipelines will use ubuntu-24.04 soon. For more details, see https://github.com/actions/runner-images/issues/10636

Build Release: Libraries/tja2fumen/src/FileEncoding/FileEncoding.cs#L51

Cannot convert null literal to non-nullable reference type.

Build Release: Libraries/tja2fumen/src/FileEncoding/FileEncoding.cs#L65

Cannot convert null literal to non-nullable reference type.

Build Release: Libraries/tja2fumen/src/FileEncoding/FileEncoding.cs#L80

Cannot convert null literal to non-nullable reference type.

Build Release: Libraries/tja2fumen/src/FileEncoding/FileEncoding.cs#L229

Cannot convert null literal to non-nullable reference type.

Build Release: Libraries/tja2fumen/src/FileEncoding/FileEncoding.cs#L329

Possible null reference assignment.

Build Release: Libraries/tja2fumen/src/FileEncoding/FileEncoding.cs#L340

Possible null reference return.

Build Release: Libraries/tja2fumen/src/FileEncoding/FileEncoding.cs#L205

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

Build Release: Libraries/tja2fumen/src/TJAConvert/TJAConvert.cs#L229

Possible null reference return.

Build Release: Libraries/tja2fumen/src/TJAConvert/TJAConvert.cs#L248

Possible null reference return.

Build Release: Libraries/tja2fumen/src/Converters.cs#L381

The variable 'e' is declared but never used

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