Remove Dead System.Security reference from StorageSync.csproj

[isra-fel]

Description

Removed reference to System.Security from project file that's causing this warning duiring build

  StorageSync netstandard2.0 succeeded with 1 warning(s) (5.5s) → artifacts/Debug/Az.StorageSync/Microsoft.Azure.PowerShell.Cmdlets.StorageSync.dll
    /usr/local/share/dotnet/sdk/10.0.100/Microsoft.Common.CurrentVersion.targets(2437,5): warning MSB3245: Could not resolve this reference. Could not locate the assembly "System.Security". Check to make sure the assembly exists on disk. If this reference is required by your code, you may get compilation errors.

Mandatory Checklist

• Please choose the target release of Azure PowerShell. (⚠️Target release is a different concept from API readiness. Please click below links for details.)

  • General release
  • Public preview
  • Private preview
  • Engineering build
  • No need for a release

• Check this box to confirm: I have read the Submitting Changes section of CONTRIBUTING.md and reviewed the following information:

• SHOULD update ChangeLog.md file(s) appropriately
  • Update src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md.
    • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header in the past tense.
  • Should not change ChangeLog.md if no new release is required, such as fixing test case only.
• SHOULD regenerate markdown help files if there is cmdlet API change. Instruction
• SHOULD have proper test coverage for changes in pull request.
• SHOULD NOT adjust version of module manually in pull request

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[Copilot]

Pull request overview

Removes an explicit System.Security assembly reference from the StorageSync project file to eliminate MSBuild reference-resolution warnings during builds (notably on newer .NET SDKs where that assembly isn’t resolvable as a standalone reference for netstandard2.0 projects).

Changes:

• Removed <Reference Include="System.Security" /> from src/StorageSync/StorageSync/StorageSync.csproj to prevent MSB3245 “Could not resolve this reference” warnings.