build(deps): bump camera-camera2 in /android

Bumps camera-camera2 from 1.2.0-alpha03 to 1.2.0-alpha04.

---
updated-dependencies:
- dependency-name: androidx.camera:camera-camera2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

@@ -52,7 +52,7 @@ dependencies {
     // Use this dependency to use the dynamically downloaded model in Google Play Services
 //    implementation 'com.google.android.gms:play-services-mlkit-barcode-scanning:18.0.0'
 
-    implementation "androidx.camera:camera-camera2:1.2.0-alpha03"
+    implementation "androidx.camera:camera-camera2:1.2.0-alpha04"
     implementation 'androidx.camera:camera-lifecycle:1.2.0-alpha04'
 
 //    // The following line is optional, as the core library is included indirectly by camera-camera2