Update dependencies

[iamcarbon]

This updates the following dependencies to their latest versions:

xunit
Microsoft.NET.Test.Sdk
coverlet.collector
Microsoft.TypeScript.MSBuild
Microsoft.AspNetCore.*
System.IdentityModel.*

And addresses various transient vulnerabilities.

[iamcarbon]

Ready for review.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.95%. Comparing base (cb71a15) to head (df4df54).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #540   +/-   ##
=======================================
  Coverage   73.95%   73.95%           
=======================================
  Files          98       98           
  Lines        2638     2638           
  Branches      446      446           
=======================================
  Hits         1951     1951           
  Misses        586      586           
  Partials      101      101           

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