Updated dependencies

pom.xml

@@ -15,8 +15,8 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <java.version>1.8</java.version>
         <java.compiler.version>1.8</java.compiler.version>
-        <scala.version>2.11.8</scala.version>
-        <scala.tools.version>2.11</scala.tools.version>
+        <scala.version>2.12.15</scala.version>
+        <scala.tools.version>2.12</scala.tools.version>
         <maven-compiler-plugin.version>2.3.2</maven-compiler-plugin.version>
         <maven-scala-plugin.version>3.2.0</maven-scala-plugin.version>
         <maven-surefire-plugin.version>2.12</maven-surefire-plugin.version>
@@ -25,8 +25,8 @@
         <kafka.version>1.0.1</kafka.version>
         <kafka-avro-serializer.version>3.3.0</kafka-avro-serializer.version>
         <avro.version>1.8.1</avro.version>
-        <spark.version>2.3.0</spark.version>
-        <cassandra.version>2.0.7</cassandra.version>
+        <spark.version>3.2.0</spark.version>
+        <cassandra.version>2.4.3</cassandra.version>
         <gson.version>2.6</gson.version>
         <slf4j.version>1.7.25</slf4j.version>
         <junit.version>4.10</junit.version>
@@ -204,7 +204,7 @@
     <repositories>
         <repository>
             <id>confluent</id>
-            <url>http://packages.confluent.io/maven/</url>
+            <url>https://packages.confluent.io/maven/</url>
         </repository>
     </repositories>