Bump DocumentFormat.OpenXml from 2.12.0 to 2.12.3
Bump DocumentFormat.OpenXml from 2.12.0 to 2.12.3

Bumps [DocumentFormat.OpenXml](https://github.com/OfficeDev/Open-XML-SDK) from 2.12.0 to 2.12.3.
- [Release notes](https://github.com/OfficeDev/Open-XML-SDK/releases)
- [Changelog](https://github.com/OfficeDev/Open-XML-SDK/blob/main/CHANGELOG.md)
- [Commits](https://github.com/OfficeDev/Open-XML-SDK/compare/v2.12.0...v2.12.3)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
microting/eform-sdk-dotnet,microting/eform-sdk-dotnet