Update gradle wrapper validation action to v4

This commit updates the `gradle/wrapper-validation-action` GitHub Action from v3 to `gradle/actions/wrapper-validation@v4` in the KMP workflow.

Author: softartdev

.github/workflows/kmp.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Check out
         uses: actions/checkout@v4
       - name: Gradle Wrapper Validation
-        uses: gradle/wrapper-validation-action@v3
+        uses: gradle/actions/wrapper-validation@v4
       - name: Set up JDK 17
         uses: actions/setup-java@v4
         with: