Bump Microsoft.AspNetCore.Mvc.Testing from 3.1.6 to 3.1.7
Bump Microsoft.AspNetCore.Mvc.Testing from 3.1.6 to 3.1.7

Bumps [Microsoft.AspNetCore.Mvc.Testing](https://github.com/aspnet/AspNetCore) from 3.1.6 to 3.1.7.
- [Release notes](https://github.com/aspnet/AspNetCore/releases)
- [Commits](https://github.com/aspnet/AspNetCore/compare/v3.1.6...v3.1.7)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
martincostello/sqllocaldb