fix: Add proper sqlite3 version constraints to appraisal gemfiles

- Rails 6.1, 7.0, 7.1 require sqlite3 ~> 1.4
- Rails 7.2+ and 8.0 can use latest sqlite3 version
- Regenerate gemfiles with correct dependencies

gemfiles/rails_6.1_active_admin_2.9.gemfile

@@ -4,7 +4,7 @@ source "https://rubygems.org"
 
 gem "rails", "~> 6.1.0"
 gem "activeadmin", "~> 2.9.0"
-gem "sqlite3"
+gem "sqlite3", "~> 1.4"
 gem "concurrent-ruby", "1.3.4"
 gem "bigdecimal"
 gem "csv"

gemfiles/rails_7.0_active_admin_2.x.gemfile

@@ -4,7 +4,7 @@ source "https://rubygems.org"
 
 gem "rails", "~> 7.0.0"
 gem "activeadmin", "~> 2.14"
-gem "sqlite3"
+gem "sqlite3", "~> 1.4"
 gem "concurrent-ruby", "1.3.4"
 gem "bigdecimal"
 gem "csv"

gemfiles/rails_7.0_active_admin_3.x.gemfile

@@ -4,7 +4,7 @@ source "https://rubygems.org"
 
 gem "rails", "~> 7.0.0"
 gem "activeadmin", "~> 3.2"
-gem "sqlite3"
+gem "sqlite3", "~> 1.4"
 gem "concurrent-ruby", "1.3.4"
 gem "bigdecimal"
 gem "csv"

gemfiles/rails_7.1_active_admin_3.x.gemfile

@@ -4,7 +4,7 @@ source "https://rubygems.org"
 
 gem "rails", "~> 7.1.0"
 gem "activeadmin", "~> 3.2"
-gem "sqlite3"
+gem "sqlite3", "~> 1.4"
 gem "concurrent-ruby", "1.3.4"
 gem "bigdecimal"
 gem "csv"