build(core): add direct guava test dependency (substrait-io#663)

Signed-off-by: Niels Pardon <par@zurich.ibm.com>

Author: nielspardon

core/build.gradle.kts

@@ -86,6 +86,7 @@ configurations[JavaPlugin.TEST_IMPLEMENTATION_CONFIGURATION_NAME].extendsFrom(sh
 dependencies {
   testImplementation(platform(libs.junit.bom))
   testImplementation(libs.protobuf.java.util)
+  testImplementation(libs.guava)
 
   testImplementation(libs.junit.jupiter)
   testRuntimeOnly(libs.junit.platform.launcher)