Improve CI/CD, remove "update" step, disable "build-debug" in master branch

.gitlab-ci.yml

@@ -40,8 +40,6 @@ android:build-release:
     - master
   except:
     - tags
-  dependencies:
-    - android:build-debug
   script:
     # Flutter local configuration
     - echo flutter.sdk=$FLUTTER_PATH > android/local.properties

android/gradle.properties

 org.gradle.jvmargs=-Xmx1536M
 android.useAndroidX=true
 android.enableJetifier=true
-app.versionName=1.0.49
-app.versionCode=50
+app.versionName=1.0.50
+app.versionCode=51

pubspec.yaml

@@ -3,7 +3,7 @@ description: A random application, for testing purpose only.
 
 publish_to: 'none'
 
-version: 1.0.49+50
+version: 1.0.50+51
 
 environment:
   sdk: '^3.0.0'