Added net461 compilation target - #978

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/

The type 'string?' cannot be used as type parameter 'T' in the generic type or method 'Assert.Equal<T>(ReadOnlySpan<T>, T[])'. Nullability of type argument 'string?' doesn't match constraint type 'System.IEquatable<string?>'.

The type 'string?' cannot be used as type parameter 'T' in the generic type or method 'Assert.Equal<T>(ReadOnlySpan<T>, T[])'. Nullability of type argument 'string?' doesn't match constraint type 'System.IEquatable<string?>'.

'MiniExcel.QueryAsDataTable(string, bool, string, ExcelType, string, IConfiguration)' is obsolete: 'QueryAsDataTable is not recommended, because it'll load all data into memory.'

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Non-nullable property 'c2' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable property 'c1' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable property 'c2' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable property 'c1' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Dereference of a possibly null reference.

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