Post-release chores after having released Solidus v4.0.0

This code has been automatically generated by our 'Prepare post-release' GitHub
action.

Make sure that:

- [ ] The new release has been published, along with its tag. See https://github.com/solidusio/solidus/releases/tag/v4.0.0
- [ ] The corresponding patch branch exists. See https://github.com/solidusio/solidus/tree/v4.0
- [ ] The corresponding backport-v4.0 label exists. See https://github.com/solidusio/solidus/labels

[skip ci]

core/lib/generators/solidus/install/app_templates/frontend/starter.rb

@@ -1 +1 @@
-apply 'https://github.com/solidusio/solidus_starter_frontend/raw/v4.0/template.rb'
+apply 'https://github.com/solidusio/solidus_starter_frontend/raw/main/template.rb'

core/lib/spree/core/version.rb

@@ -1,14 +1,14 @@
 # frozen_string_literal: true
 
 module Spree
-  VERSION = "4.0.0"
+  VERSION = "4.1.0.dev"
 
   def self.solidus_version
     VERSION
   end
 
   def self.previous_solidus_minor_version
-    '3.4'
+    '4.0'
   end
 
   def self.solidus_gem_version

docker-compose.yml

@@ -27,7 +27,7 @@ services:
         NODE_VERSION: 14
         MYSQL_VERSION: "8.0"
         BUNDLER_VERSION: 2
-    image: solidus-4.0.0
+    image: solidus-4.1.0.dev
     command: bash -c "(bundle check || bundle) && bash -c 'echo Container initialized, see README.md for further steps.' && tail -f /dev/null"
     environment:
       CAPYBARA_DRIVER: selenium_chrome_headless_docker_friendly