[crossgen2] Update minimum maccatalyst versions to 15.2

[kotlarmilos]

Description

Crossgen2 is currently compiling for maccatalyst 15.2 but linking against 15.0. This change ensures that R2R object file is built and linked against the same version on maccatalyst.

Error log:

##[error]ld(0,0): error : (NETCORE_ENGINEERING_TELEMETRY=Build) object file (/Users/runner/work/1/s/artifacts/obj/coreclr/crossgen-corelib/maccatalyst.x64.Release/System.Private.CoreLib.o) was built for newer 'macCatalyst' version (15.2) than being linked (15.0)

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[Copilot]

Pull request overview

This PR updates the minimum maccatalyst version from 15.0 to 15.2 for crossgen2 and corelib builds to align the linking version with the compilation version.

• Updated AppleMinOSVersion property for maccatalyst from 15.0 to 15.2 in crossgen2 targets
• Updated AppleMinOSVersion property for maccatalyst from 15.0 to 15.2 in crossgen-corelib project

Reviewed changes

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

File	Description
src/tasks/Crossgen2Tasks/Microsoft.NET.CrossGen.targets	Updates maccatalyst minimum OS version to 15.2 for crossgen2 R2R compilation
src/coreclr/crossgen-corelib.proj	Updates maccatalyst minimum OS version to 15.2 for corelib crossgen compilation

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[Copilot]

The maccatalyst minimum version is being updated to 15.2 in this file, but the same version in src/coreclr/nativeaot/BuildIntegration/Microsoft.NETCore.Native.Unix.targets at line 81 is still set to 15.0. For consistency, that file should also be updated to 15.2 to ensure NativeAOT builds use the same minimum version.

[kotlarmilos]

/azp run runtime-maccatalyst

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