[KGP][IT] Require Xcode 26 for shouldDownloadLightNativeBundleWithMaven

This KGP test downloads a "light" K/N dist and therefore builds platform
libraries on the test machine:
NativeDownloadAndPlatformLibsIT.shouldDownloadLightNativeBundleWithMaven

KT-80209 updates the platform library .def files to Xcode 26, so
platform libraries are no longer buildable with earlier Xcode versions.
This makes the test fail on the CI agents that still use Xcode 16.0.

To fix this, this commit updates the test annotation
`@RequiredXCodeVersion` from 14.1 to 26.0. So the test is now ignored
when run with earlier Xcode versions, which effectively mutes it until
the agents are updated to Xcode 26 (KTI-2654).

Author: SvyatoslavScherbina

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/native/NativeDownloadAndPlatformLibsIT.kt

@@ -264,7 +264,7 @@ class NativeDownloadAndPlatformLibsIT : KGPBaseTest() {
     }
 
     @DisplayName("Download light Native bundle with maven")
-    @RequiredXCodeVersion(minSupportedMajor = 14, minSupportedMinor = 1)
+    @RequiredXCodeVersion(minSupportedMajor = 26, minSupportedMinor = 0)
     @GradleTest
     fun shouldDownloadLightNativeBundleWithMaven(gradleVersion: GradleVersion) {
         // FIXME: We have to use CURRENT for cinterop generation when testing the light bundle (KT-71419). Always use CURRENT after KTI-1928 is done