Bump core from 3.3.0 to 3.4.0

Bumps [core](https://github.com/zxing/zxing) from 3.3.0 to 3.4.0.
- [Release notes](https://github.com/zxing/zxing/releases)
- [Changelog](https://github.com/zxing/zxing/blob/master/CHANGES)
- [Commits](https://github.com/zxing/zxing/compare/zxing-3.3.0...zxing-3.4.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

android/build.gradle

@@ -180,7 +180,7 @@ dependencies {
     // https://github.com/ligi/PassAndroid/issues/181
     // Don't upgrade before minSDK 19 - or replace zxing
     //noinspection GradleDependency
-    implementation 'com.google.zxing:core:3.3.0'
+    implementation 'com.google.zxing:core:3.4.0'
 
     debugImplementation 'com.squareup.leakcanary:leakcanary-android:2.2'