build: Bump compileSdk to 33

Now required by several libraries (check open dependabot PRs)

Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>

app/build.gradle

@@ -73,7 +73,7 @@ def perfAnalysis = project.hasProperty('perfAnalysis')
 
 android {
 
-    compileSdkVersion 32
+    compileSdkVersion 33
     // install this NDK version and Cmake to produce smaller APKs. Build will still work if not installed
     ndkVersion "${ndkEnv.get("NDK_VERSION")}"