Re-add junit plugin dependency and bump gson (#139)

pom.xml

@@ -55,14 +55,15 @@ THE SOFTWARE.
         <configuration-as-code.version>1.55.1</configuration-as-code.version>
         <credentials.version>2.6.1.1</credentials.version>
         <doxia-sink-api.version>1.1.2</doxia-sink-api.version>
-        <gson.version>2.8.8</gson.version>
+        <gson.version>2.8.9</gson.version>
         <hpi.compatibleSinceVersion>3.0</hpi.compatibleSinceVersion>
         <influxdb-client-java.version>4.1.0</influxdb-client-java.version>
         <jacoco.version>1.0.12</jacoco.version>
         <java.level>8</java.level>
         <jenkins.version>2.249.1</jenkins.version>
         <jimfs.version>1.0</jimfs.version>
         <junit.version>4.13.1</junit.version>
+        <junit_plugin.version>1.23</junit_plugin.version>
         <kotlin-stdlib.version>1.3.71</kotlin-stdlib.version>
         <mailer.version>1.20</mailer.version>
         <maven-reporting-api.version>3.0</maven-reporting-api.version>
@@ -192,6 +193,11 @@ THE SOFTWARE.
             <version>${junit.version}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.jenkins-ci.plugins</groupId>
+            <artifactId>junit</artifactId>
+            <version>${junit_plugin.version}</version>
+        </dependency>
         <dependency>
             <groupId>org.mockito</groupId>
             <artifactId>mockito-core</artifactId>