Update AGP version in tests to stable 9.0.0 (#4420)

Author: whyoleg

dokka-integration-tests/gradle/src/main/kotlin/org/jetbrains/dokka/it/gradle/junit/TestedVersionsSource.kt

@@ -112,7 +112,7 @@ fun interface TestedVersionsSource<T : TestedVersions> {
             "8.11.2",
             "8.12.3",
             "8.13.2",
-            "9.0.0-rc02",
+            "9.0.0",
         ).map { SemVer(it) }
 
         private val matchedAgpVersions: List<SemVer> =

dokka-integration-tests/gradle/src/test/kotlin/junit/TestedVersionsSourceTest.kt

@@ -55,14 +55,14 @@ class TestedVersionsSourceTest {
         val expected = when (kotlinBuiltIn) {
             Required ->
                 """
-                agp: 9.0.0-rc02
+                agp: 9.0.0
                 gradle: 9.2.1
                 kgp: 2.1.21, 2.2.21, 2.3.0
                 """.trimIndent()
 
             Supported ->
                 """
-                agp: 7.4.2, 8.11.2, 8.12.3, 8.13.2, 9.0.0-rc02
+                agp: 7.4.2, 8.11.2, 8.12.3, 8.13.2, 9.0.0
                 gradle: 7.6.4, 8.14.3, 9.2.1
                 kgp: 1.9.25, 2.0.21, 2.1.21, 2.2.21, 2.3.0
                 """.trimIndent()
@@ -89,15 +89,15 @@ class TestedVersionsSourceTest {
         val expected = when (kotlinBuiltIn) {
             Required ->
                 """
-                agp: 9.0.0-rc02
+                agp: 9.0.0
                 composeGradlePlugin: 1.7.0
                 gradle: 9.2.1
                 kgp: 2.1.21, 2.2.21, 2.3.0
                 """.trimIndent()
 
             Supported ->
                 """
-                agp: 7.4.2, 8.11.2, 8.12.3, 8.13.2, 9.0.0-rc02
+                agp: 7.4.2, 8.11.2, 8.12.3, 8.13.2, 9.0.0
                 composeGradlePlugin: 1.7.0
                 gradle: 7.6.4, 8.14.3, 9.2.1
                 kgp: 1.9.25, 2.0.21, 2.1.21, 2.2.21, 2.3.0