chore: remove manual SVN installation from deploy workflow

The 10up/action-wordpress-plugin-deploy action includes SVN
installation, making the manual apt-get step redundant.

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: GaryJones

.github/workflows/deploy.yml

@@ -19,11 +19,6 @@ jobs:
         with:
           persist-credentials: false
 
-      - name: Install SVN (Subversion)
-        run: |
-          sudo apt-get update
-          sudo apt-get install subversion
-
       - name: WordPress Plugin Deploy
         uses: 10up/action-wordpress-plugin-deploy@54bd289b8525fd23a5c365ec369185f2966529c2 # 2.3.0
         env: