maven: Fix changelog format

[scurvydoggo]

There was a typo in the maven config 🤦

The incrementals-tools tool uses -rc%d.%s as the default changelist format (instead of the desired %d.v%s as per the plugin guide). I think this is what caused the latest release build to fail, due to the tag starting with a -.

[INFO] Setting: -Dchangelist=-rc586.88708ce878fc -DscmTag=88708ce878fc051841ea8ab32749d51e0f89ea08
...
gh api -F tag=-rc586.88708ce878fc -F message=-rc586.88708ce878fc -F object=88708ce878fc051841ea8ab32749d51e0f89ea08 -F type=commit /repos/jenkinsci/github-oauth-plugin/git/tags
gh: Could not verify tag name (HTTP 422)

https://github.com/jenkinsci/github-oauth-plugin/actions/runs/5709233552

Testing done

Submitter checklist

Beta Give feedback

1. Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
2. Ensure that the pull request title represents the desired changelog entry
3. Please describe what you did
4. Link to relevant issues in GitHub or Jira
5. Link to relevant pull requests, esp. upstream and downstream changes
6. Ensure you have provided tests - that demonstrates feature works or fixes the issue