Test fixes for AppVeyor build - #2546

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-dotnet@v4, github/codeql-action/analyze@v3, github/codeql-action/init@v3. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Non-nullable field '_roboto' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Non-nullable field '_coldEngine' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Non-nullable field '_warmEngine' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Non-nullable field '_fontFolders' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

The field 'FontsBinaryReader._numberOfReadBytes' is assigned but its value is never used

The result of the expression is always 'false' since a value of type 'int' is never equal to 'null' of type 'int?'

The annotation for nullable reference types should only be used in code within a '#nullable' annotations context.

The field 'FontsBinaryReader._numberOfReadBytes' is assigned but its value is never used

The result of the expression is always 'false' since a value of type 'int' is never equal to 'null' of type 'int?'

The annotation for nullable reference types should only be used in code within a '#nullable' annotations context.

Cannot build an overlay database because build-mode is set to "undefined" instead of "none". Falling back to creating a normal full database instead.