Add Apache Commons Text to dependencies list

[charles-toller]

Use of StringSubstitutor without a dependency on the Apache Commons Text library causes a ClassNotFoundException on a fresh Jenkins install. This PR adds that dependency to the pom.xml file to alleviate this issue.

Testing done

Automated CI checks; also tested on a fresh Jenkins instance and it resolves the issue listed above.

Submitter checklist

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

[jetersen]

This is not correct; it should be using https://github.com/jenkinsci/commons-text-api-plugin
which is a part of the bom so you do not need to specify version.
This is to avoid version conflicts between commons-text.