Update SetCredentialsAttributesW to match the native C API declaration

[ksharperd]

Change the P/Invoke declaration for SetCredentialsAttributesW to use uint rather than long, since C unsigned long is 4 bytes on Windows.

Fix #131416

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[ksharperd]

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[Copilot]

Pull request overview

Updates the Windows SSPI interop for SetCredentialsAttributesW so its parameter widths match the native unsigned long (32-bit) declaration, preventing x86 stdcall name decoration mismatches during NativeAOT DirectPInvoke linking.

Changes:

• Changed Interop.SspiCli.SetCredentialsAttributesW P/Invoke parameters from long to uint (4 bytes) to match native ULONG on Windows.
• Updated the SslStreamPal.Windows call site to pass uint values for the attribute and buffer size.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/libraries/System.Net.Security/src/System/Net/Security/SslStreamPal.Windows.cs	Updates the call site to pass 32-bit uint arguments matching the corrected P/Invoke signature.
src/libraries/Common/src/Interop/Windows/SspiCli/Interop.SSPI.cs	Fixes SetCredentialsAttributesW P/Invoke signature to use 32-bit uint parameters for x86 correctness.

[wfurt]

The documentation shows "unsigned long": https://learn.microsoft.com/en-us/windows/win32/api/sspi/nf-sspi-setcredentialsattributesw

[ksharperd]

The documentation shows "unsigned long": https://learn.microsoft.com/en-us/windows/win32/api/sspi/nf-sspi-setcredentialsattributesw

unsigned long is always 4 bytes on Windows, per #131416 (comment)

[wfurt]

it sad the the compilation is not smart enough to know that but so be it...