Ruby 4.0 support (#43650).

Patch by Mizuki ISHIKAWA (user:ishikawa999).


git-svn-id: https://svn.redmine.org/redmine/trunk@24367 e93f8b46-1217-0410-a6f0-8f06a7374b81

.github/workflows/tests.yml

@@ -10,7 +10,7 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ['3.2', '3.3', '3.4']
+        ruby: ['3.2', '3.3', '3.4', '4.0']
         db: ['postgresql', 'mysql2', 'sqlite3']
       fail-fast: false
 
@@ -79,7 +79,7 @@ jobs:
         uses: ./.github/actions/setup-redmine
         with:
           db-type: sqlite3
-          ruby-version: '3.4'
+          ruby-version: '4.0'
 
       # System tests use Chrome and ChromeDriver installed on the GitHub Actions Ubuntu image.
       # They are generally updated to the latest stable versions.

Gemfile

@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-ruby '>= 3.2.0', '< 3.5.0'
+ruby '>= 3.2.0', '< 4.1.0'
 
 gem 'rails', '8.1.2'
 gem 'rouge', '~> 4.5'
@@ -29,6 +29,7 @@ gem 'csv', '~> 3.3.2'
 gem 'net-imap', '~> 0.5.7'
 gem 'net-pop', '~> 0.1.2'
 gem 'net-smtp', '~> 0.5.0'
+gem 'ostruct'
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
 gem 'tzinfo-data', platforms: [:mingw, :x64_mingw, :mswin]

doc/INSTALL

@@ -7,7 +7,7 @@ https://www.redmine.org/
 
 == Requirements
 
-* Ruby 3.2, 3.3, 3.4
+* Ruby 3.2, 3.3, 3.4, 4,0
 
 * A database:
   * MySQL (tested with MySQL 8)