Bump docker-commons from 1.14 to 1.15

Bumps [docker-commons](https://github.com/jenkinsci/docker-commons-plugin) from 1.14 to 1.15.
- [Release notes](https://github.com/jenkinsci/docker-commons-plugin/releases)
- [Commits](jenkinsci/docker-commons-plugin@docker-commons-1.14...docker-commons-1.15)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

pom.xml

@@ -227,7 +227,7 @@
     <dependency>
       <groupId>org.jenkins-ci.plugins</groupId>
       <artifactId>docker-commons</artifactId>
-      <version>1.14</version>
+      <version>1.15</version>
     </dependency>
   </dependencies>