Update action examples to install svn

[thrijith]

Description of the Change

• Update action examples to install svn

Closes https://github.com/10up/action-wordpress-plugin-deploy/issues/151

Checklist:

• [x] I agree to follow this project's Code of Conduct.
• [x] I have updated the documentation accordingly.
• [x] I have added Critical Flows, Test Cases, and/or End-to-End Tests to cover my change.
• [x] All new and existing tests pass.