build: update to Gradle 8.12 / remove duplicated Gradle versions (#2176)

Signed-off-by: Jendrik Johannes <jendrik.johannes@gmail.com>

example-android/README.md

@@ -1,6 +1,7 @@
 # Example Android application
 
 ## Description
+
 Example Android Application is designed to showcase various functionalities
 and capabilities when working with the Hedera™ Java SDK.
 It operates on a `testnet` environment and offers the following features
@@ -10,14 +11,15 @@ the "Generate" button.
 - **Account Balance tab** allows you to retrieve the balance of an account by
 pressing the "Get Account Balance" button and specifying the desired account,
 which can be different from the default account specified in the
-  [`app/src/main/res/values/strings.xml`](app/src/main/res/values/strings.xml) file.
+[`app/src/main/res/values/strings.xml`](app/src/main/res/values/strings.xml) file.
 - **Crypto Transfer tab** allows you to transfer a specified amount of HBARs
 from your account to a recipient account by pressing the "Send HBAR" button
 and setting the recipient's account in the provided text field.
 
 ## Usage
 
 ### Configuration
+
 Running the example requires `operator_id` and `operator_key`
 resource strings to be set in
 [`app/src/main/res/values/strings.xml`](app/src/main/res/values/strings.xml).
@@ -30,7 +32,7 @@ resource strings to be set in
 You can then build and install the application on a connected device or emulator:
 
 ```
-./gradlew installDebug
+../gradlew installDebug
 ```
 
 ## Running with local vs published SDK version

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.11.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.12-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME