fix: Add Gradle wrapper JAR for CI/CD compatibility

- Remove gradle-wrapper.jar from .gitignore
- Add gradle-wrapper.jar to repository (required for GitHub Actions)
- Update Gradle wrapper to version 8.9
- Fix CI/CD build error: 'Unable to access jarfile gradle-wrapper.jar'

This file is essential for CI/CD systems like GitHub Actions to build
the project without requiring Gradle to be pre-installed.

Author: BayuBatam2008

.gitignore

@@ -40,8 +40,5 @@ google-services.json
 # Ignore Gradle build output directory
 build
 
-# Gradle wrapper binary
-gradle/wrapper/gradle-wrapper.jar
-
 # Ignore Kotlin specific files
 .kotlin/

gradle/wrapper/gradle-wrapper.jar

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-9.1.0-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.9-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME