Bump plugin pom from 4.66 to 4.67

[MarkEWaite]

Bump plugin pom from 4.66 to 4.67

https://github.com/jenkinsci/plugin-pom/releases/tag/plugin-4.67 provides more details of the changes, including:

• Fix hamcrest versioning - @timja https://redirect.github.com/jenkinsci/plugin-pom/issues/785
• Update HtmlUnit package for jacoco - @timja https://redirect.github.com/jenkinsci/plugin-pom/issues/778

Testing done

Compiles and tests successfully on Linux with Java 11.

### Submitter checklist
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- [x] Ensure that the pull request title represents the desired changelog entry
- [x] Please describe what you did
- [x] Link to relevant issues in GitHub or Jira
- [x] Link to relevant pull requests, esp. upstream and downstream changes
- [x] Ensure you have provided tests - that demonstrates feature works or fixes the issue