Deploy to GitHub releases

Update NPOI to 2.5.3

Fix comment

Remove unnecessary Ignore attribute

Merge branch 'master' of github.com:mganss/ExcelMapper

Merge pull request mganss#118 from mganss/dependabot/nuget/System.Tex…

…t.Json-5.0.2

Bump System.Text.Json from 5.0.1 to 5.0.2

Bump System.Text.Json from 5.0.1 to 5.0.2

Bumps [System.Text.Json](https://github.com/dotnet/runtime) from 5.0.1 to 5.0.2.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v5.0.1...v5.0.2)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Merge pull request mganss#117 from mganss/dependabot/nuget/Microsoft.…

…NET.Test.Sdk-16.9.4

Bump Microsoft.NET.Test.Sdk from 16.9.1 to 16.9.4

Bump Microsoft.NET.Test.Sdk from 16.9.1 to 16.9.4

Bumps [Microsoft.NET.Test.Sdk](https://github.com/microsoft/vstest) from 16.9.1 to 16.9.4.
- [Release notes](https://github.com/microsoft/vstest/releases)
- [Commits](microsoft/vstest@v16.9.1...v16.9.4)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Add support for non-uniform number of columns (fixes mganss#115)