Bump to latest android8 CI to support jdk >11

Signed-off-by: tobiasKaminsky <tobias@kaminsky.me>

.drone.yml

@@ -4,7 +4,7 @@ name: generic
 
 steps:
   - name: generic
-    image: ghcr.io/nextcloud/continuous-integration-android8:2
+    image: ghcr.io/nextcloud/continuous-integration-android8:3
     commands:
       - ./gradlew --console=plain assembleGeneric
 
@@ -23,7 +23,7 @@ name: gplay
 
 steps:
   - name: gplay
-    image: ghcr.io/nextcloud/continuous-integration-android8:2
+    image: ghcr.io/nextcloud/continuous-integration-android8:3
     commands:
       - ./gradlew --console=plain assembleGplay
 
@@ -42,7 +42,7 @@ name: tests
 
 steps:
   - name: all
-    image: ghcr.io/nextcloud/continuous-integration-android8:2
+    image: ghcr.io/nextcloud/continuous-integration-android8:3
     privileged: true
     commands:
       - emulator -avd android -no-snapshot -gpu swiftshader_indirect -no-window -no-audio -skin 500x833 &