Update gradle/actions action to v4

Author: renovate[bot]

.github/workflows/docs.yml

@@ -81,7 +81,7 @@ jobs:
           fetch-depth: 0
 
       - name: Setup Gradle
-        uses: gradle/actions/setup-gradle@v3
+        uses: gradle/actions/setup-gradle@v4
 
       - name: Run Dokka
         run: ./gradlew dokkaGenerate

.github/workflows/platforms.yml

@@ -14,6 +14,6 @@ jobs:
       - name: Checkout Sources
         uses: actions/checkout@v4
       - name: Setup Gradle
-        uses: gradle/actions/setup-gradle@v3
+        uses: gradle/actions/setup-gradle@v4
       - name: Check Platforms Table
         run: ./gradlew verifyPlatformTable --no-configuration-cache