Bump appcompat from 1.3.1 to 1.4.2 (#302)

Bumps appcompat from 1.3.1 to 1.4.2.

---
updated-dependencies:
- dependency-name: androidx.appcompat:appcompat
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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app/build.gradle

@@ -54,7 +54,7 @@ dependencies {
 
     implementation 'androidx.exifinterface:exifinterface:1.3.3'
     testImplementation 'junit:junit:4.13.2'
-    implementation 'androidx.appcompat:appcompat:1.3.1'
+    implementation 'androidx.appcompat:appcompat:1.4.2'
     implementation 'com.google.android.material:material:1.6.1'
     implementation 'com.google.zxing:core:3.5.0'
     implementation 'com.github.ctodobom:OpenCV-3.1.0-Android:9e00ee4218ca0c9e60a905c9f09bf499f9dc5115'