[QUIC] Update Windows MsQuic

[ManickaP]

No description provided.

[Copilot]

Pull Request Overview

This PR updates the Windows MsQuic dependency to version 2.4.15 from the previous version 2.4.8. This is a standard dependency update to incorporate newer features, bug fixes, or security improvements from the MsQuic library.

• Updates MsQuic Schannel version from 2.4.8 to 2.4.15

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/ncl
See info in area-owners.md if you want to be subscribed.

[ManickaP]

Running tests with expected version on Windows:

MsQuic supported and using 'msquic.dll 2.4.15.130165181 (ccc4b18d1900930aae512a453013665d03dac7fd)' (Schannel).
    System.Net.Quic.Tests.MsQuicPlatformDetectionTests.UnsupportedPlatforms_ThrowsPlatformNotSupportedException [SKIP]
      Condition(s) not met: "IsQuicUnsupported"
MsQuic Counters:
    CONN_CREATED 1605
    CONN_HANDSHAKE_FAIL 24
    CONN_APP_REJECT 8
    CONN_LOAD_REJECT 0

Unobserved exceptions of 0 different types: 

  Finished:    System.Net.Quic.Functional.Tests
=== TEST EXECUTION SUMMARY ===
   System.Net.Quic.Functional.Tests  Total: 429, Errors: 0, Failed: 0, Skipped: 1, Time: 94.948s

[ManickaP]

/ba-g #119763

[ManickaP]

/backport to release/10.0

[github-actions]

Started backporting to release/10.0: https://github.com/dotnet/runtime/actions/runs/17768705332

[github-actions]

@ManickaP backporting to "release/10.0" failed, the patch most likely resulted in conflicts:

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

Applying: Update Windows MsQuic
Using index info to reconstruct a base tree...
M	eng/Versions.props
Falling back to patching base and 3-way merge...
Auto-merging eng/Versions.props
CONFLICT (content): Merge conflict in eng/Versions.props
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 Update Windows MsQuic
Error: The process '/usr/bin/git' failed with exit code 128

Please backport manually!