Bump the powershell-sdk group with 1 update

[dependabot]

Updated Microsoft.PowerShell.SDK from 7.4.14 to 7.4.15.

Release notes

Sourced from Microsoft.PowerShell.SDK's releases.

7.4.15

## 7.4.15

General Cmdlet Updates and Fixes

• Delay update notification for one week to ensure all packages become available (#​27229)
• Close pipe client handles after creating the child ssh process (#​27139)

Tests

• Fix the PSNativeCommandArgumentPassing test (#​27146)

Build and Packaging Improvements

Update .NET SDK to 8.0.420

• Fix the container image for vPack, MSIX vPack and Package pipelines (#​27018)
• Update branch for release (#​27279)
• Fix package pipeline by adding in PDP-Media directory (#​27255)
• Pin ready-to-merge.yml reusable workflow to commit SHA (#​27247)
• [StepSecurity] ci: Harden GitHub Actions tags (#​27244)
• Build, package, and create VPack for the PowerShell-LTS store package within the same msixbundle-vpack pipeline (#​27242)
• Change the display name of PowerShell-LTS package to PowerShell LTS (#​27232)
• [StepSecurity] ci: Harden GitHub Actions tokens (#​27231)
• Redo windows image fix to use latest image (#​27230)
• Separate Store Package Creation, Skip Polling for Store Publish, Clean up PDP-Media (#​27228)
• Add comment-based help documentation to build.psm1 functions (#​27227)
• Fix a preview detection test for the packaging script (#​27226)
• Update the PhoneProductId to be the official LTS id used by Store (#​27169)
• Select New MSIX Package Name (#​27173)
• Publish .msixbundle package as a VPack (#​27187)
• Bump github/codeql-action from 4.32.4 to 4.35.1 (#​27143) (#​27171) (#​27175)
• release-upload-buildinfo: replace version-comparison channel gating with metadata flags (#​27147)
• Create infrastructure to create two msixs and msixbundles for LTS and Stable (#​27145)
• Move _GetDependencies MSBuild target from dynamic generation in build.psm1 into Microsoft.PowerShell.SDK.csproj (#​27144)
• Bump actions/dependency-review-action from 4.8.3 to 4.9.0 (#​27142)
• Bump actions/upload-artifact from 6 to 7 (#​27141)
• Separate Official and NonOfficial templates for ADO pipelines (#​27140)
• Mirror .NET/runtime ICU version range in PowerShell (#​27138)

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