[main] Update dependencies from microsoft/testfx

[dotnet-maestro]

This pull request updates the following dependencies

From https://github.com/microsoft/testfx

• Subscription: 6b3b8571-4059-4db5-9b07-cd5e649ae2cc
• Build: 20260905.2 (330665)
• Date Produced: September 5, 2026 10:52:30 PM UTC
• Commit: a179d7cba3416133a4b3f161093f7636bdb778fa
• Branch: main

• Dependency Updates:
  • From 2.5.0-preview.26454.15 to 2.5.0-preview.26455.2
    • Microsoft.Testing.Platform
  • From 4.5.0-preview.26454.15 to 4.5.0-preview.26455.2
    • MSTest

[microsoft-github-policy-service]

Auto-approve

[Copilot]

🟢 Approval recommended

The version and dependency metadata updates are complete and internally consistent.

Pull request overview

Updates MSTest and Microsoft.Testing.Platform dependencies to build 20260905.2.

Changes:

• Bumps MSTest to 4.5.0-preview.26455.2.
• Bumps Microsoft.Testing.Platform to 2.5.0-preview.26455.2.
• Synchronizes dependency metadata with commit a179d7cba3.

File summaries

File	Description
eng/Versions.props	Updates package version properties.
eng/Version.Details.xml	Updates dependency versions and commit SHAs.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Balanced

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[github-actions]

**Final analysis — Azure Pipelines build [1584715]((dev.azure.com/redacted)

This is the completed (full) analysis for build 1584715, superseding any preliminary comment.

Failure signature: Dispose_FromANotificationHandler_DoesNotSelfWaitOnTheReadLoop (Microsoft.Testing.Platform.ServerMode.Client.Sources.UnitTests, net8.0) failed on the Windows Release leg only:

Assertion failed. Expected value to be less than the upper bound.
Dispose from a notification handler took 4803 ms; it must not self-wait on the read loop.
upper bound: 00:00:04, actual: 00:00:04.8028935

Correlation:

• Only 1 failing/retried test candidate in this build; all other legs (Windows Debug, Linux Release, macOS Release) passed for this test.
• No CTRF retry attempts recorded — this ran once and failed once (no fail-then-pass evidence, so it does not meet the flaky-test bar).
• History (12 completed builds over the last 30 days, not flagged incomplete) shows this exact test passing on every sampled leg with durations of 9 ms–364 ms, well under the 4-second bound. There is no prior occurrence of this test approaching, let alone crossing, the threshold.

Assessment: This looks like a one-off timing-margin failure — the actual elapsed time (4.80 s) exceeded a hard-coded 4-second assertion bound by ~800 ms, most likely due to a momentarily loaded/slow Windows Release CI agent rather than a code or product regression (historical runs complete in well under 1 s). No open or recently closed issue matches this signature (checked issues #11039, #10898 — unrelated). Per the escalation thresholds, a single non-recurring, non-flaky, non-regression failure tied only to this PR's build does not warrant a new issue.

Next step if this recurs: if Dispose_FromANotificationHandler_DoesNotSelfWaitOnTheReadLoop fails again on Windows Release in a subsequent build (same or another PR), that would establish recurrence and justify either loosening the timing margin in MtpServerClientInProcessTests.cs:410 or filing a flaky/regression issue at that point.

No further action taken; re-run the Windows Release leg if needed.

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