deploy.sh: line 63: svn: command not found

[scott-sharethis]

Describe the bug
When running a deploy for a new plugin version I'm now receiving this error for all plugins I try to deploy:
/home/runner/work/_actions/10up/action-wordpress-plugin-deploy/stable/deploy.sh: line 63: svn: command not found

ubuntu-latest does still contain SVN so I'm not sure what the reason for the sudden command not found is.

Steps to Reproduce

1. Create github action worflow using:
   name: Deploy to WordPress.org
   on:
   push:
   tags:
   - "*"
   jobs:
   tag:
   name: New tag
   runs-on: ubuntu-latest
   steps:
   - uses: actions/checkout@master
   - name: WordPress Plugin Deploy
   uses: 10up/action-wordpress-plugin-deploy@stable
   env:
   SVN_PASSWORD: ${{ secrets.SVN_PASSWORD }}
   SVN_USERNAME: ${{ secrets.SVN_USERNAME }}
2. Run action
3. See error in response and fail

Expected behavior
Deploy happens successfully without error.

Additional context
This was working for all plugins 8 months ago during my last deploy of the plugin updates.

[jeffpaul]

@scott-sharethis see notes in #158 (comment) to help resolve this issue