Exclude rails 8/ruby 3.1 combo

Author: djmb

.github/workflows/main.yml

@@ -31,7 +31,9 @@ jobs:
         gemfile: [ rails_7_2, rails_8_0, rails_main ]
         database: [sqlite, postgres, mysql]
         exclude:
-          - ruby-version: "3.4"
+          - ruby-version: "3.1"
+            gemfile: rails_8_0
+          - ruby-version: "3.1"
             gemfile: rails_main
     services:
       redis:

.rubocop.yml

@@ -6,7 +6,7 @@ require:
   - rubocop-md
 
 AllCops:
-  TargetRubyVersion: 3.1
+  TargetRubyVersion: 3.4
   # RuboCop has a bunch of cops enabled by default. This setting tells RuboCop
   # to ignore them, so only the ones explicitly set in this file are enabled.
   DisabledByDefault: true