Update PowerShell formulas to latest versions (7.5.3, 7.6.0-preview.5, 7.4.12)

[Copilot]

Summary

This PR updates all three PowerShell Homebrew formulas to their latest released versions as of October 2025.

Changes

powershell (Stable Channel)

• Version: 7.5.2 → 7.5.3
• Release Date: September 10, 2025
• Updated download URLs and SHA256 hashes for both arm64 and x64 macOS architectures
• Updated test assertion to validate version 7.5.3

powershell-preview (Preview Channel)

• Version: 7.6.0-preview.4 → 7.6.0-preview.5
• Release Date: October 9, 2025
• Updated download URLs and SHA256 hashes for both arm64 and x64 macOS architectures
• Updated test assertion to validate version 7.6.0-preview.5

powershell-lts (Long Term Support Channel)

• Version: 7.4.11 → 7.4.12
• Release Date: September 10, 2025
• Updated download URLs and SHA256 hashes for both arm64 and x64 macOS architectures
• Updated test assertion to validate version 7.4.12

Verification

All SHA256 hashes were obtained from the official PowerShell GitHub releases and verified for accuracy:

• v7.5.3 Release
• v7.6.0-preview.5 Release
• v7.4.12 Release

All SHA256 hashes are in lowercase format as required by the formula comments and Homebrew conventions.

Testing

Ruby syntax validation passed for all three formula files.

[!WARNING]

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• aka.ms
  • Triggering command: pwsh -Command Invoke-RestMethod 'REDACTED' | ConvertTo-Json (dns block)
  • Triggering command: curl -s REDACTED (dns block)
  • Triggering command: pwsh -Command Invoke-RestMethod 'REDACTED' | Select-Object ReleaseTag (dns block)
• https://api.github.com/repos/PowerShell/PowerShell/releases
  • Triggering command: curl -sL REDACTED (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

update the powershell, powershell-preview, and powershell-lts formulas

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