Fix XA4211 warning message to use TargetPlatformVersion for .NET 6+

[Copilot]

Customers reported that the XA4211 warning message contains outdated property references and blank values for .NET 6+ projects:

AndroidManifest.xml: Warning XA4211 : AndroidManifest.xml //uses-sdk/@android:targetSdkVersion '34' is less than $(TargetFrameworkVersion) ''. Using API-35 for ACW compilation.

The warning was written during the Xamarin.Android timeframe and needs updating for .NET 6+:

• Property name: $(TargetFrameworkVersion) should be $(TargetPlatformVersion) for .NET 6+
• Blank values: The empty '' appears because the message references the wrong property

Changes

Updated the XA4211 message in Resources.resx:

• Changed message text from $(TargetFrameworkVersion) to $(TargetPlatformVersion)
• Updated comment documentation to reference the correct property
• Updated parameter description to reflect "target platform version number"

This occurs when developers explicitly set a lower target SDK version in their AndroidManifest.xml:

<uses-sdk android:targetSdkVersion="34" />

The warning is reasonable to show, but the message text should be accurate for modern .NET Android projects.

Fixes #10196.

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses

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

• ci.dot.net
  • Triggering command: curl -s --fail REDACTED (dns 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 my firewall allow list