Update Ruby and Apartment versions for Rails 8.0 support

[mnovelo]

Upgrade Ruby and Apartment versions, and add new gemfiles to support Rails 8.0. Remove deprecated appraisals for earlier Rails versions.

[codecov]

❌ 5 Tests Failed:

Tests completed	Failed	Passed	Skipped
434	5	429	0

View the top 2 failed tests by shortest run time

spec.integration.query_caching_spec query caching when use_schemas = true clears the ActiveRecord::QueryCache after switching databases

Stack Traces | 0.0143s run time

RSpec::Core::MultipleExceptionError

spec.integration.connection_handling_spec connection handling monkey patch when ActiveRecord >= 6.0 switches to the previous set tenant

Stack Traces | 0.0167s run time

RSpec::Core::MultipleExceptionError

View the full list of 1 ❄️ flaky tests

spec.tenant_spec Apartment::Tenant using mysql #adapter should load mysql adapter

Flake rate in main: 7.14% (Passed 78 times, Failed 6 times)

Stack Traces | 0.0148s run time

Failure/Error: expect(subject.adapter).to be_a(Apartment::Adapters::Mysql2Adapter)
  expected #<Apartment::Adapters::Mysql2SchemaAdapter:0x00007ff05f54a7c0 @config={adapter: "mysql2", database: "...t", min_messages: "WARNING", host: "127.0.0.1", port: 3306}, @default_tenant="apartment_mysql_test"> to be a kind of Apartment::Adapters::Mysql2Adapter
./spec/tenant_spec.rb:14:in 'block (4 levels) in <top (required)>'
..../spec/support/setup.rb:27:in 'block (2 levels) in Apartment::Spec::Setup.included'

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[mnovelo]

Looks like Ruby 3.4 is not compatible with Rails 6.1 or 7. We continue to struggle to support SQLite 3.