Upgrade CameraX to 1.1.0 and fork removal.

qr/lib/src/main/java/org/signal/qr/ImageProxyLuminanceSource.kt

@@ -1,6 +1,7 @@
 package org.signal.qr
 
 import android.graphics.ImageFormat
+import androidx.annotation.RequiresApi
 import androidx.camera.core.ImageProxy
 import com.google.zxing.LuminanceSource
 import java.nio.ByteBuffer
@@ -13,6 +14,7 @@ import java.nio.ByteBuffer
  * An image width can be reported as 1080 but the row stride may be 1088. Thus when representing a row-major
  * 2D array as a 1D array, the math can go sideways if width is used instead of row stride.
  */
+@RequiresApi(21)
 class ImageProxyLuminanceSource(image: ImageProxy) : LuminanceSource(image.width, image.height) {
 
   val yData: ByteArray

qr/lib/src/main/java/org/signal/qr/QrProcessor.kt

@@ -1,5 +1,6 @@
 package org.signal.qr
 
+import androidx.annotation.RequiresApi
 import androidx.camera.core.ImageProxy
 import com.google.zxing.BinaryBitmap
 import com.google.zxing.ChecksumException
@@ -23,6 +24,7 @@ class QrProcessor {
   private var previousHeight = 0
   private var previousWidth = 0
 
+  @RequiresApi(21)
   fun getScannedData(proxy: ImageProxy): String? {
     return getScannedData(ImageProxyLuminanceSource(proxy))
   }