[Repo Assist] Fix Windows CI: use 127.0.0.1 instead of localhost for test HTTP servers

[github-actions]

🤖 This is an automated pull request from Repo Assist, an AI assistant for this repository.

Problem

The Windows CI build was failing with:

System.IO.IOException: Failed to bind to address (localhost/redacted)
 ---> System.Net.Sockets.SocketException (10013): An attempt was made to access a socket in a way forbidden by its access permissions.

When Kestrel binds to localhost, it tries to bind to both 127.0.0.1 (IPv4) and ::1 (IPv6). On Windows GitHub Actions runners, IPv6 socket creation is forbidden (WSAEACCES / error 10013), causing the whole server startup to fail — and with it, any test that uses the local HTTP test server.

This was causing 1 test failure out of 2847 in FSharp.Data.Core.Tests on Windows.

Fix

Replace (localhost/redacted) with (127.0.0.1/redacted) in the two test helpers that spin up a local Kestrel server:

• tests/FSharp.Data.Core.Tests/Http.fs — startHttpLocalServer()
• tests/FSharp.Data.Core.Tests/XmlExtensions.fs — startXmlHttpLocalServer()

Using an explicit IPv4 address bypasses the dual-stack bind and works on all platforms.

Files changed

• tests/FSharp.Data.Core.Tests/Http.fs
• tests/FSharp.Data.Core.Tests/XmlExtensions.fs

Test Status

Minimal two-line change in test infrastructure only. No production code changed. The fix directly addresses the error observed in CI run https://github.com/fsprojects/FSharp.Data/actions/runs/22380588390.

Generated by Repo Assist following a request by @dsyme

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