chore: remove deprecated macosX64 target

[devcrocod]

Remove macosX64() target from multiplatform configuration

Motivation and Context

macosX64 is deprecated in Kotlin 2.2 and scheduled for removal in 2.3

How Has This Been Tested?

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Breaking Changes

for users of macosX64, no longer get a native macosX64 artifact

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

[Copilot]

Pull request overview

Removes the deprecated macosX64() Kotlin/Native target from the shared mcp.multiplatform Gradle convention plugin, aligning the build with Kotlin 2.2’s deprecation and the planned removal in Kotlin 2.3.

Changes:

• Removed the macosX64() target from the Kotlin Multiplatform target configuration.
• Kept macosArm64() as the macOS native target going forward.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.

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