build: drop support for Redmine 4.2

Author: xel1045

.github/workflows/tests.yml

@@ -9,10 +9,10 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        redmine: ["4.2", "5.0"]
+        redmine: ["5.0", "5.1", "6.0"]
         db: ["sqlite", "mysql", "postgresql"]
         include:
-          - ruby: "2.7"
+          - ruby: "3.1"
 
     name: "Ruby ${{ matrix.ruby }} / Redmine ${{ matrix.redmine }} / ${{ matrix.db }}"
 

init.rb

@@ -10,7 +10,7 @@
   url 'https://github.com/eXolnet/redmine_wbs'
   author_url 'https://www.exolnet.com'
 
-  requires_redmine :version_or_higher => '4.2'
+  requires_redmine :version_or_higher => '5.0'
 
   settings :default => {},
            :partial => 'settings/wbs/general'