Use stable tag on deploy action

Author: jeremyfelt

.github/workflows/deploy-to-wp.yml

@@ -10,7 +10,7 @@ jobs:
         steps:
             - uses: actions/checkout@master
             - name: WordPress Plugin Deploy
-              uses: 10up/action-wordpress-plugin-deploy@2.2.2
+              uses: 10up/action-wordpress-plugin-deploy@stable
               env:
                   SVN_PASSWORD: ${{ secrets.SVN_PASSWORD }}
                   SVN_USERNAME: ${{ secrets.SVN_USERNAME }}