fix: isolate Kotlin dependency to test scope. (#731)

Author: overcat

CHANGELOG.md

@@ -5,6 +5,7 @@
 ### Update:
 - refactor: add validation for asset issuer. ([#725](https://github.com/stellar/java-stellar-sdk/pull/725))
 - refactor: add validation for liquidity pool ID length in `TrustLineAsset`. ([#726](https://github.com/stellar/java-stellar-sdk/pull/726))
+- fix: isolate Kotlin dependency to test scope. ([#731](https://github.com/stellar/java-stellar-sdk/pull/731))
 
 ## 2.0.0-beta1
 

build.gradle.kts

@@ -50,6 +50,7 @@ dependencies {
     implementation("org.bouncycastle:bcprov-jdk18on:1.79")
     implementation("commons-codec:commons-codec:1.17.1")
 
+    testImplementation(kotlin("stdlib"))
     testImplementation("org.mockito:mockito-core:5.14.2")
     testImplementation("com.squareup.okhttp3:mockwebserver:${okhttpVersion}")
     testImplementation("junit:junit:4.13.2")

gradle.properties

@@ -0,0 +1,3 @@
+# This flag prevents the Kotlin Gradle plugin from automatically adding
+# the kotlin-stdlib dependency to the 'implementation' configuration.
+kotlin.stdlib.default.dependency=false