Bump System.Text.Json from 8.0.1 to 8.0.4 in /test/RulesEngine.UnitTe…

…st (#618)

Bumps System.Text.Json from 8.0.1 to 8.0.4.

---
updated-dependencies:
- dependency-name: System.Text.Json
  dependency-type: direct:production
...

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