Increment patch version from 67 to 68

Update version.props

Bump System.Data.SqlClient in /src/SmartSql.DataConnector (#223)

Bumps [System.Data.SqlClient](https://github.com/dotnet/corefx) from 4.8.3 to 4.8.5.
- [Release notes](https://github.com/dotnet/corefx/releases)
- [Commits](https://github.com/dotnet/corefx/commits)

---
updated-dependencies:
- dependency-name: System.Data.SqlClient
  dependency-type: direct:production
...

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Update version.props

fix #213

Update version.props

update version

update version

fix TypeDeserializer bug when resultType is String

update version