Add explicit junit launcher dependency (smithy-lang#2542)

Author: JordonPhillips

buildSrc/src/main/kotlin/smithy.java-conventions.gradle.kts

@@ -85,6 +85,7 @@ tasks {
 dependencies {
     testImplementation(libs.junit.jupiter.api)
     testRuntimeOnly(libs.junit.jupiter.engine)
+    testRuntimeOnly(libs.junit.platform.launcher)
     testImplementation(libs.junit.jupiter.params)
     testImplementation(libs.hamcrest)
     testCompileOnly(libs.apiguardian.api)

gradle/libs.versions.toml

@@ -39,6 +39,7 @@ junit-bom = { module = "org.junit:junit-bom", version.ref = "junit5" }
 junit-jupiter-api = { module = "org.junit.jupiter:junit-jupiter-api", version.ref = "junit5" }
 junit-jupiter-engine = { module = "org.junit.jupiter:junit-jupiter-engine", version.ref = "junit5" }
 junit-jupiter-params = { module = "org.junit.jupiter:junit-jupiter-params", version.ref = "junit5" }
+junit-platform-launcher = { module = "org.junit.platform:junit-platform-launcher" }
 hamcrest = { module = "org.hamcrest:hamcrest", version.ref = "hamcrest" }
 assertj-core = { module = "org.assertj:assertj-core", version.ref = "assertj" }
 mockserver = { module = "org.mock-server:mockserver-netty", version.ref = "mockserver" }
@@ -56,4 +57,4 @@ smithy-jar = { id = "software.amazon.smithy.gradle.smithy-jar", version.ref = "s
 shadow = { id = "com.gradleup.shadow", version.ref = "shadow" }
 jreleaser = { id = "org.jreleaser", version.ref = "jreleaser" }
 runtime = { id = "org.beryx.runtime", version.ref = "runtime"}
-checksum = { id = "org.gradle.crypto.checksum", version.ref = "gradle-checksum" }
+checksum = { id = "org.gradle.crypto.checksum", version.ref = "gradle-checksum" }