Drop support for Android 5.x

It's 5-6 years old, and only accounts for 2% of users in the Firebase analytics.

app/src/main/java/eu/kanade/tachiyomi/ui/manga/MangaController.kt

@@ -290,23 +290,17 @@ class MangaController :
         fab.setOnClickListener {
             val item = presenter.getNextUnreadChapter()
             if (item != null) {
-                // Create animation listener
-                val revealAnimationListener: Animator.AnimatorListener = object : AnimatorListenerAdapter() {
-                    override fun onAnimationStart(animation: Animator?) {
-                        openChapter(item.chapter, true)
-                    }
-                }
-
                 // Get coordinates and start animation
                 actionFab?.getCoordinates()?.let { coordinates ->
-                    if (!binding.revealView.showRevealEffect(
-                            coordinates.x,
-                            coordinates.y,
-                            revealAnimationListener
-                        )
-                    ) {
-                        openChapter(item.chapter)
-                    }
+                    binding.revealView.showRevealEffect(
+                        coordinates.x,
+                        coordinates.y,
+                        object : AnimatorListenerAdapter() {
+                            override fun onAnimationStart(animation: Animator?) {
+                                openChapter(item.chapter, true)
+                            }
+                        }
+                    )
                 }
             } else {
                 view?.context?.toast(R.string.no_next_chapter)

app/src/main/java/eu/kanade/tachiyomi/ui/manga/info/MangaInfoHeaderAdapter.kt

@@ -1,7 +1,5 @@
 package eu.kanade.tachiyomi.ui.manga.info
 
-import android.graphics.PorterDuff
-import android.os.Build
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
@@ -21,7 +19,6 @@ import eu.kanade.tachiyomi.source.model.SManga
 import eu.kanade.tachiyomi.source.online.HttpSource
 import eu.kanade.tachiyomi.ui.manga.MangaController
 import eu.kanade.tachiyomi.util.system.copyToClipboard
-import eu.kanade.tachiyomi.util.system.getResourceColor
 import eu.kanade.tachiyomi.util.view.setChips
 import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.merge
@@ -304,18 +301,6 @@ class MangaInfoHeaderAdapter(
                     initialLoad = false
                 }
             }
-
-            // backgroundTint attribute doesn't work properly on Android 5
-            if (Build.VERSION.SDK_INT == Build.VERSION_CODES.LOLLIPOP) {
-                listOf(binding.backdropOverlay, binding.mangaInfoToggleMoreScrim)
-                    .forEach {
-                        @Suppress("DEPRECATION")
-                        it.background.setColorFilter(
-                            view.context.getResourceColor(android.R.attr.colorBackground),
-                            PorterDuff.Mode.SRC_ATOP
-                        )
-                    }
-            }
         }
 
         private fun showMangaInfo(visible: Boolean) {