Bump actions/setup-dotnet from 5 to 6 - #59

Nullability of reference types in type of parameter 'other' of 'bool PackageApp.Equals(PackageApp other)' doesn't match implicitly implemented member 'bool IEquatable<PackageApp>.Equals(PackageApp? other)' (possibly because of nullability attributes).

Nullability of type of parameter 'obj' doesn't match overridden member (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'other' of 'bool FeaturedCategory.Equals(FeaturedCategory other)' doesn't match implicitly implemented member 'bool IEquatable<FeaturedCategory>.Equals(FeaturedCategory? other)' (possibly because of nullability attributes).

Nullability of type of parameter 'obj' doesn't match overridden member (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'other' of 'bool PriceOverview.Equals(PriceOverview other)' doesn't match implicitly implemented member 'bool IEquatable<PriceOverview>.Equals(PriceOverview? other)' (possibly because of nullability attributes).

Nullability of type of parameter 'obj' doesn't match overridden member (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'other' of 'bool SteamApp.Equals(SteamApp other)' doesn't match implicitly implemented member 'bool IEquatable<SteamApp>.Equals(SteamApp? other)' (possibly because of nullability attributes).

Nullability of type of parameter 'obj' doesn't match overridden member (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'other' of 'bool AppInfo.Equals(AppInfo other)' doesn't match implicitly implemented member 'bool IEquatable<AppInfo>.Equals(AppInfo? other)' (possibly because of nullability attributes).