Fix a couple more gradle deprecations (#4367)

Author: trask

buildSrc/src/main/kotlin/ai.smoke-test-jar.gradle.kts

@@ -7,5 +7,5 @@ plugins {
 
 val aiSmokeTest = extensions.getByType(AiSmokeTestExtension::class)
 
-aiSmokeTest.testAppArtifactDir.set(tasks.getByName<Jar>("bootJar").destinationDirectory.get())
-aiSmokeTest.testAppArtifactFilename.set(tasks.getByName<Jar>("bootJar").archiveFileName.get())
+aiSmokeTest.testAppArtifactDir.set(tasks.bootJar.flatMap { it.destinationDirectory })
+aiSmokeTest.testAppArtifactFilename.set(tasks.bootJar.flatMap { it.archiveFileName })

buildSrc/src/main/kotlin/ai.smoke-test-war.gradle.kts

@@ -13,7 +13,7 @@ tasks.war {
 
 val aiSmokeTest = extensions.getByType(AiSmokeTestExtension::class)
 
-aiSmokeTest.testAppArtifactDir.set(tasks.getByName<War>("war").destinationDirectory.get())
+aiSmokeTest.testAppArtifactDir.set(tasks.war.flatMap { it.destinationDirectory })
 aiSmokeTest.testAppArtifactFilename.set(project.name + ".war")
 
 dependencies {