Bump Microsoft.AspNetCore.AzureAppServices.HostingStartup
Bump Microsoft.AspNetCore.AzureAppServices.HostingStartup

Bumps [Microsoft.AspNetCore.AzureAppServices.HostingStartup](https://github.com/aspnet/AspNetCore) from 3.1.4 to 3.1.5.
- [Release notes](https://github.com/aspnet/AspNetCore/releases)
- [Changelog](https://github.com/dotnet/aspnetcore/blob/master/docs/CrossRepoBreakingChanges.md)
- [Commits](https://github.com/aspnet/AspNetCore/commits)

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