cypress: gutenberg tests fail in WP 5.5, so run with WP 5.4

Author: contactashish13

.travis.yml

@@ -26,7 +26,6 @@ matrix:
         - docker-compose -f docker-compose.travis.yml up -d
         - chmod +x ./bin/run-e2e-tests.sh ./bin/wp-init.sh && ./bin/wp-init.sh && ./bin/run-e2e-tests.sh
     - name: Cypress Gutenberg
-      env: WP_VERSION=5.4
       language: node_js
       node_js:
         - 10.8

bin/wp-init.sh

@@ -23,7 +23,7 @@ docker exec $args visualizer_wordpress wp --allow-root core install --url="http:
 # update core
 docker exec $args visualizer_wordpress chown -R www-data:www-data /var/www/html/
 docker exec $args visualizer_wordpress chmod 0777 -R /var/www/html/wp-content
-docker exec $args visualizer_wordpress wp --allow-root core update
+docker exec $args visualizer_wordpress wp --allow-root core update --version=5.4
 docker exec $args visualizer_wordpress wp --allow-root core update-db
 
 # install required external plugins