Fix plugin-check CLI path error caused by wp-env folder naming (#491)

Co-authored-by: swissspidy <841956+swissspidy@users.noreply.github.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

Author: Copilot

action.yml

@@ -111,7 +111,7 @@ runs:
       run: |
         touch .wp-env.json
         > .wp-env.json
-        echo "{ \"core\": $WP_VERSION, \"port\": 8880, \"testsPort\": 8881, \"plugins\": [ \"https://downloads.wordpress.org/plugin/plugin-check.latest-stable.zip\" ], \"mappings\": { \"wp-content/plugins/$PLUGIN_SLUG\": \"$PLUGIN_DIR\" } }" >> .wp-env.json
+        echo "{ \"core\": $WP_VERSION, \"port\": 8880, \"testsPort\": 8881, \"plugins\": [ \"https://downloads.wordpress.org/plugin/plugin-check.zip\" ], \"mappings\": { \"wp-content/plugins/$PLUGIN_SLUG\": \"$PLUGIN_DIR\" } }" >> .wp-env.json
 
         npm -g --no-fund i @wordpress/env
       shell: bash