chore: Fix JSON002 error

[DaveTryon]

Building the project locally, I get 2 errors when I happen to have this file opened in the IDE:

Severity	Code	Description	Project	File	Line
Error (active)	JSON002	Probable JSON string detected	Microsoft.Sbom.Api.Tests (net6.0), Microsoft.Sbom.Api.Tests (net8.0)	.\test\Microsoft.Sbom.Api.Tests\Config\ConfigurationBuilderTestsBase.cs	65
Error (active)	JSON002	Probable JSON string detected	Microsoft.Sbom.Api.Tests (net6.0), Microsoft.Sbom.Api.Tests (net8.0)	.\test\Microsoft.Sbom.Api.Tests\Config\ConfigurationBuilderTestsBase.cs	66

The IDE suggests making these interpolated strings, which silences the error. Seems like the IDE is being a bit extra picky, but the low-risk change seems like a better option than adding some sort of override.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.82%. Comparing base (494fa75) to head (47538dd).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #603   +/-   ##
=======================================
  Coverage   59.82%   59.82%           
=======================================
  Files         268      268           
  Lines        8249     8249           
  Branches      972      972           
=======================================
  Hits         4935     4935           
  Misses       2886     2886           
  Partials      428      428           

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