Fix xunit major version mismatch in test project

[Copilot]

xunit.runner.visualstudio was bumped to 3.1.5 while xunit remained at 2.9.3 — incompatible major versions that break test discovery under dotnet test. The v3 runner requires xunit.v3; it does not support the xunit 2.x packages.

Changes

• ColonesExchangeRate.Tests.csproj: Downgrade xunit.runner.visualstudio 3.1.5 → 2.8.2 (latest v2 release) to align with xunit 2.9.3

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• api.hacienda.go.cr
  • Triggering command: /usr/share/dotnet/dotnet /usr/share/dotnet/dotnet exec --runtimeconfig /home/REDACTED/work/ColonesExchangeRate/ColonesExchangeRate/src/NuGet/ColonesExchangeRate.Tests/bin/Debug/net10.0/ColonesExchangeRate.Tests.runtimeconfig.json --depsfile /home/REDACTED/work/ColonesExchangeRate/ColonesExchangeRate/src/NuGet/ColonesExchangeRate.Tests/bin/Debug/net10.0/ColonesExchangeRate.Tests.deps.json /home/REDACTED/work/ColonesExchangeRate/ColonesExchangeRate/src/NuGet/ColonesExchangeRate.Tests/bin/Debug/net10.0/testhost.dll --port 42049 --endpoint 127.0.0.1:042049 --role client --parentprocessid 4077 --telemetryoptedin false (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)