[Gradle, Test] Remove ktor 1_5_4 and coroutines 1_4_3-native-mt test

as consuming coroutines 1.4.3-native-mt is no longer compatible with
current KGP version. Since it transitively depends on
old atomicfu of version 0.15.1. And that atomicfu library was published
with experimental publication model by old Multiplatform Gradle Plugin

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

@@ -26,36 +26,6 @@ class NativeExternalDependenciesIT : BaseGradleIT() {
         assertNull(externalDependenciesText)
     }
 
-    @Test
-    fun `ktor 1_5_4 and coroutines 1_4_3-native-mt`() {
-        // These versions of Ktor and coroutines don't support macos-arm64
-        assumeFalse(hostIsMacArm64())
-
-        buildProjectWithDependencies(
-            "io.ktor:ktor-io:1.5.4",
-            "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.4.3-native-mt"
-        ) { externalDependenciesText ->
-            assertNotNull(externalDependenciesText)
-
-            assertEquals(
-                """
-                |0 native-external-dependencies
-                |1 io.ktor:ktor-io,io.ktor:ktor-io-$MASKED_TARGET_NAME[1.5.4] #0[1.5.4]
-                |${'\t'}/some/path/ktor-io.klib
-                |${'\t'}/some/path/ktor-io-cinterop-bits.klib
-                |${'\t'}/some/path/ktor-io-cinterop-sockets.klib
-                |2 org.jetbrains.kotlinx:atomicfu,org.jetbrains.kotlinx:atomicfu-$MASKED_TARGET_NAME[0.15.1] #3[0.15.1] #1[0.15.1]
-                |${'\t'}/some/path/atomicfu.klib
-                |${'\t'}/some/path/atomicfu-cinterop-interop.klib
-                |3 org.jetbrains.kotlinx:kotlinx-coroutines-core,org.jetbrains.kotlinx:kotlinx-coroutines-core-$MASKED_TARGET_NAME[1.4.3-native-mt] #0[1.4.3-native-mt] #1[1.4.3-native-mt]
-                |${'\t'}/some/path/kotlinx-coroutines-core.klib
-                |
-                """.trimMargin(),
-                externalDependenciesText
-            )
-        }
-    }
-
     @Test
     fun `ktor 1_5_4 and coroutines 1_5_0-RC-native-mt`() {
         // These versions of Ktor and coroutines don't support macos-arm64