Fix Idn failing tests

[tarekgh]

Fixes #115006

[Copilot]

Pull Request Overview

This PR addresses failing tests by updating the ICU version threshold for selecting the appropriate IdnaTest file.

• Lower the version threshold for selecting "IdnaTest_15_1.txt" to 72.
• Adjust the test configuration in the Factory.cs file to match expected ICU behavior.

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[carlossanlop]

I think these are also failing in the prev4 branch. Can you please backport? It would be tell-mode, I can merge it.

[ericstj]

LGTM if it fixes the issue. Seems like we're updating based on observation of which ICU versions we see in the places we test - anything we need to do to look at the ICU build / repo to find exact version where this change was introduced?

[carlossanlop]

Confirmed it's also affecting prev4: https://github.com/dotnet/runtime/pull/114979/checks?check_run_id=41117511379

[ericstj]

Confirmed it's also affecting prev4: https://github.com/dotnet/runtime/pull/114979/checks?check_run_id=41117511379

Yes, I opened the issue based on a P4 PR

[tarekgh]

/backport to release/10.0-preview4

[github-actions]

Started backporting to release/10.0-preview4: https://github.com/dotnet/runtime/actions/runs/14652881804

[tarekgh]

/backport to release/9.0-staging

[github-actions]

Started backporting to release/9.0-staging: https://github.com/dotnet/runtime/actions/runs/14653792031

[github-actions]

@tarekgh backporting to "release/9.0-staging" failed, the patch most likely resulted in conflicts:

$ git am --3way --empty=keep --ignore-whitespace --keep-non-patch changes.patch

Applying: Fix Idn failing tests
Using index info to reconstruct a base tree...
M	src/libraries/System.Runtime/tests/System.Globalization.Extensions.Tests/IdnMapping/Data/Factory.cs
Falling back to patching base and 3-way merge...
Auto-merging src/libraries/System.Runtime/tests/System.Globalization.Extensions.Tests/IdnMapping/Data/Factory.cs
CONFLICT (content): Merge conflict in src/libraries/System.Runtime/tests/System.Globalization.Extensions.Tests/IdnMapping/Data/Factory.cs
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config set advice.mergeConflict false"
Patch failed at 0001 Fix Idn failing tests
Error: The process '/usr/bin/git' failed with exit code 128

Please backport manually!