[Dependencies]: use version ranges for dependencies

**Is your feature request related to a problem? Please describe.**
Our security scanner Trivy picks up packages inside Arcus.WebApi as deprecated.
(System.Text.RegularExpressions, Microsoft.IdentityModel.JsonWebTokens and System.IdentityModel.Tokens.Jwt)

**Describe the solution you'd like**
Make sure that we use version ranges to always support a range of versions and prevent the use of deprecated packages.

No files, tests, or entry points are named. Start by locating Arcus.WebApi's dependency declarations and reproducing the Trivy scan; done means the listed deprecated packages are replaced or constrained with version ranges and the scan no longer reports them.

Written by the indexing model from the issue text.