chore(deps): update nuget non-major dependencies

This PR contains the following updates:

Package	Type	Update	Change
Azure.Security.KeyVault.Secrets (source)	nuget	minor	`4.4.0` -> `4.5.0`
Microsoft.AspNetCore.Mvc.Testing (source)	nuget	patch	`6.0.14` -> `6.0.15`

Release Notes

Azure/azure-sdk-for-net

### [`v4.5.0`](https://togithub.com/Azure/azure-sdk-for-net/releases/tag/Azure.Security.KeyVault.Secrets_4.5.0) ##### 4.5.0 (2023-03-14) ##### Breaking Changes - Service version "7.4-preview.1" is not supported. ##### Other Changes - The default service version is now "7.4".

dotnet/aspnetcore

### [`v6.0.15`](https://togithub.com/dotnet/aspnetcore/releases/tag/v6.0.15): .NET 6.0.15 [Release](https://togithub.com/dotnet/core/releases/tag/v6.0.15)

Configuration

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Altinn / altinn-register

chore(deps): update nuget non-major dependencies #110

Release Notes

Configuration