Set compileSdk and targetSdk to 33 (Android 13)

android:exported in now required in the manifest on all activities/services/receivers/providers. It was set to true for those that need to interact with outside apps or the OS, while others have exported=false.
This also required updating LeakCanary to the latest version as the older version being used was not using android:exported in AndroidManifest.xml.

app/src/main/java/org/schabi/newpipe/player/gesture/PopupPlayerGestureListener.kt

@@ -160,15 +160,15 @@ class PopupPlayerGestureListener(
         }
     }
 
-    override fun onLongPress(e: MotionEvent?) {
+    override fun onLongPress(e: MotionEvent) {
         playerUi.updateScreenSize()
         playerUi.checkPopupPositionBounds()
         playerUi.changePopupSize(playerUi.screenWidth)
     }
 
     override fun onFling(
-        e1: MotionEvent?,
-        e2: MotionEvent?,
+        e1: MotionEvent,
+        e2: MotionEvent,
         velocityX: Float,
         velocityY: Float
     ): Boolean {