Update spark and gradle versions, fix deprecated features

src/test/scala/com/barrelsofdata/sparkexamples/DriverTest.scala

@@ -22,20 +22,19 @@ class DriverTest extends AnyFunSuite with BeforeAndAfterAll {
     PropertyConfigurator.configure(properties)
   }
 
-  override def beforeAll: Unit = {
+  override def beforeAll(): Unit = {
     setupLogger()
     LOG.info("Setting up spark session")
     spark = SparkSession.builder().appName(JOB_NAME).master("local[*]").getOrCreate()
   }
+  
+  override def afterAll(): Unit = {
+    LOG.info("Closing spark session")
+    spark.close()
+  }
 
   test("Check if spark session is working") {
     LOG.info("Testing spark job")
     assertResult("hello")(spark.sql("SELECT 'hello'").collect().head.get(0))
   }
-
-  override def afterAll: Unit = {
-    LOG.info("Closing spark session")
-    spark.close()
-  }
-
 }