Fix compilation warning: 'compileDebugJavaWithJavac' task (current target is 1.8) and 'compileDebugKotlin' task (current target is 11) jvm target compatibility should be set to the same Java version.

library/multipicker/build.gradle

@@ -35,6 +35,11 @@ android {
         }
     }
 
+    compileOptions {
+        sourceCompatibility versions.sourceCompat
+        targetCompatibility versions.targetCompat
+    }
+
     kotlinOptions {
         jvmTarget = "11"
     }