Update several dependencies, most important retrofit from 2.5.0 -> 2.6.1

Author: majst01

pom.xml

@@ -221,13 +221,13 @@
     <dependency>
       <groupId>org.junit.jupiter</groupId>
       <artifactId>junit-jupiter-engine</artifactId>
-      <version>5.5.0-M1</version>
+      <version>5.5.1</version>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>org.junit.platform</groupId>
       <artifactId>junit-platform-runner</artifactId>
-      <version>1.5.0-M1</version>
+      <version>1.5.1</version>
       <scope>test</scope>
     </dependency>
     <dependency>
@@ -239,29 +239,29 @@
     <dependency>
       <groupId>org.assertj</groupId>
       <artifactId>assertj-core</artifactId>
-      <version>3.12.2</version>
+      <version>3.13.2</version>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>org.mockito</groupId>
       <artifactId>mockito-core</artifactId>
-      <version>2.28.2</version>
+      <version>3.0.0</version>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>com.squareup.retrofit2</groupId>
       <artifactId>retrofit</artifactId>
-      <version>2.5.0</version>
+      <version>2.6.1</version>
     </dependency>
     <dependency>
       <groupId>com.squareup.retrofit2</groupId>
       <artifactId>converter-moshi</artifactId>
-      <version>2.5.0</version>
+      <version>2.6.1</version>
     </dependency>
     <dependency>
     <groupId>org.msgpack</groupId>
       <artifactId>msgpack-core</artifactId>
-      <version>0.8.16</version>
+      <version>0.8.17</version>
     </dependency>
     <!-- If we use okhttp instead of java urlconnection we achieve server failover
             of the influxdb server address resolves to all influxdb server ips. -->