Update dependency io.jenkins.docker:docker-plugin to v1.8.0

Author: renovate[bot]

integrations/pom.xml

@@ -61,7 +61,7 @@
     <dependency>
       <groupId>io.jenkins.docker</groupId>
       <artifactId>docker-plugin</artifactId>
-      <version>1.7.0</version>
+      <version>1.8.0</version>
       <scope>test</scope>
     </dependency>
     <dependency>