Drop support for Rails 6.1

.github/workflows/ci.yml

@@ -61,7 +61,6 @@ jobs:
         rails:
           - rails_7.1.0
           - rails_7.0.8
-          - rails_6.1.7
         adapter:
           - sqlite3
           - postgresql

ajax-datatables-rails.gemspec

@@ -24,6 +24,6 @@ Gem::Specification.new do |s|
 
   s.files = `git ls-files`.split("\n")
 
-  s.add_dependency 'rails', '>= 6.1'
+  s.add_dependency 'rails', '>= 7.0'
   s.add_dependency 'zeitwerk'
 end

appraisal.yml

@@ -1,37 +1,4 @@
 ---
-6.1.7:
-  sqlite3:
-    version: ~> 1.5.0
-    install_if: '-> { ENV["DB_ADAPTER"] == "sqlite3" }'
-  mysql2:
-    version: ''
-    install_if: '-> { ENV["DB_ADAPTER"] == "mysql2" }'
-  activerecord-trilogy-adapter:
-    version: ''
-    install_if: '-> { ENV["DB_ADAPTER"] == "trilogy" }'
-  activerecord-oracle_enhanced-adapter:
-    version: ~> 6.1.0
-    install_if: '-> { ENV["DB_ADAPTER"] == "oracle_enhanced" }'
-  ruby-oci8:
-    version: ''
-    install_if: '-> { ENV["DB_ADAPTER"] == "oracle_enhanced" }'
-  activerecord-postgis-adapter:
-    version: ''
-    install_if: '-> { ENV["DB_ADAPTER"] == "postgis" }'
-  base64:
-    version: ''
-    install_if: '-> { Gem::Version.new(RUBY_VERSION) >= Gem::Version.new("3.4.0") }'
-  bigdecimal:
-    version: ''
-    install_if: '-> { Gem::Version.new(RUBY_VERSION) >= Gem::Version.new("3.4.0") }'
-  mutex_m:
-    version: ''
-    install_if: '-> { Gem::Version.new(RUBY_VERSION) >= Gem::Version.new("3.4.0") }'
-  drb:
-    version: ''
-    install_if: '-> { Gem::Version.new(RUBY_VERSION) >= Gem::Version.new("3.4.0") }'
-
-
 7.0.8:
   sqlite3:
     version: ~> 1.5.0