Upgrade GHA workflows (#491)

.github/workflows/main.yml

@@ -47,7 +47,7 @@ jobs:
 
     steps:
     - name: checkout
-      uses: actions/checkout@v6
+      uses: actions/checkout@v7
 
     - name: build, test and lint
       run: |
@@ -61,7 +61,7 @@ jobs:
         distribution: 'zulu'
         java-version: 25
 
-    - uses: actions/cache@v5
+    - uses: actions/cache@v6
       id: avd-cache
       with:
         path: |
@@ -70,7 +70,7 @@ jobs:
           ~/.android/debug.keystore
         key: avd-${{ matrix.api-level }}-${{ matrix.os }}-${{ matrix.target }}-${{ matrix.arch }}
 
-    - uses: gradle/actions/setup-gradle@v5
+    - uses: gradle/actions/setup-gradle@v6
 
     - name: assemble tests
       working-directory: test-fixture