Use Java 17 with Guava

Author: tomasz-tylenda-sonarsource

its/ruling/src/test/java/org/sonar/java/it/JavaRulingTest.java

@@ -194,7 +194,7 @@ public void guava() throws Exception {
     MavenBuild build = test_project("com.google.guava:guava", projectName);
     build
       // by default guava is compatible with java 6, however this is not supported with JDK 21
-      .setProperty("java.version", "1.8")
+      .setProperty("java.version", "17")
       .setProperty("maven.javadoc.skip", "true")
       // use batch
       .setProperty("sonar.java.experimental.batchModeSizeInKB", "8192");