[windows] Upgrade PHP version to 8.5

[shivammathur]

Description

Update PHP to 8.5 on Windows

Related issue: #13603

Check list

• Related issue / work item is attached
• Tests are written (if applicable)
• Documentation is updated (if applicable)
• Changes are tested and related VM images are successfully generated

[Copilot]

Pull request overview

Updates the Windows toolset configuration to target PHP 8.5.

Changes:

• Bump PHP from 8.4 to 8.5 in the Windows Server 2022 toolset.
• Bump PHP from 8.4 to 8.5 in the Windows Server 2025 toolset.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
images/windows/toolsets/toolset-2022.json	Updates the configured PHP major/minor version to 8.5 for Windows Server 2022 images.
images/windows/toolsets/toolset-2025.json	Updates the configured PHP major/minor version to 8.5 for Windows Server 2025 images.

[Copilot]

The toolset now targets PHP 8.5, but the published Windows image README files still list PHP 8.4.16 (e.g., images/windows/Windows2025-Readme.md:24 and Windows2022-Readme.md:23). Please update the Windows readmes/software report artifacts in the same PR (or clarify and link to where/when they will be regenerated) so the documented installed software matches the toolset configuration.

[Copilot]

The toolset now targets PHP 8.5, but the published Windows image README files still list PHP 8.4.16 (e.g., images/windows/Windows2022-Readme.md:23 and Windows2025-Readme.md:24). Please update the Windows readmes/software report artifacts in the same PR (or clarify and link to where/when they will be regenerated) so the documented installed software matches the toolset configuration.