Remove unnecessary explicit NuGet references

[oskogstad]

When upgrading to .NET9, we had to add some explicit references to packages that previously were implicit.
The ones referencing these were using old versions, and because of new analyzer updates in .NET9 we get warnings for vulnerabilities in these versions, and warnings are errors!

So we either had to disable <TreatWarningsAsErrors> or disable the warnings, both bad options.
The least bad option is to explicitly upgrade all of these NuGets.

They should be removed once the ones making the implicit references happen have updated their NuGets.

These Nugets:

• System.Text.Json
• System.Drawing.Common
• Microsoft.IdentityModel.JsonWebTokens
• System.IdentityModel.Tokens.Jwt
• System.Formats.Asn1

in these projects:

• Application Integration Tests
• SlackNotifier
• Utils AspNet
• WebAPI
• Infrastructure
• CDC