Update actions/cache action to v6

Author: renovate[bot]

.github/workflows/quality-assurance.yml

@@ -60,7 +60,7 @@ jobs:
 
       - name: Cache Android jar
         id: android-cache
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: android-jar-cache
           key: ${{ runner.os }}-android-version-26

.github/workflows/samples-windows.yml

@@ -28,7 +28,7 @@ jobs:
         uses: gradle/actions/setup-gradle@v6
 
       - name: Cache maven dependencies
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: ~/.m2/repository
           key: samples-${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}