Bump prismatic:plumbing from 0.5.5 to 0.6.0 in /dependabot

Bumps [prismatic:plumbing](https://github.com/plumatic/plumbing) from 0.5.5 to 0.6.0.
- [Changelog](https://github.com/plumatic/plumbing/blob/master/CHANGELOG.md)
- [Commits](plumatic/plumbing@plumbing-0.5.5...plumbing-0.6.0)

---
updated-dependencies:
- dependency-name: prismatic:plumbing
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

dependabot/pom.xml

@@ -73,7 +73,7 @@
     <dependency>
       <groupId>prismatic</groupId>
       <artifactId>plumbing</artifactId>
-      <version>0.5.5</version>
+      <version>0.6.0</version>
       <exclusions>
         <exclusion>
           <artifactId>linked</artifactId>