Bump Microsoft.EntityFrameworkCore.Design from 3.1.7 to 3.1.8
Bump Microsoft.EntityFrameworkCore.Design from 3.1.7 to 3.1.8

Bumps [Microsoft.EntityFrameworkCore.Design](https://github.com/dotnet/efcore) from 3.1.7 to 3.1.8.
- [Release notes](https://github.com/dotnet/efcore/releases)
- [Commits](https://github.com/dotnet/efcore/compare/v3.1.7...v3.1.8)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
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