Explicitly require logger library in spec_helper

[trliner]

The CI pipeline is current failing for certain matrix configurations that rely on ActiveSupport < 7.1:

An error occurred while loading ./spec/storage/grid_fs_spec.rb.
Failure/Error: require 'carrierwave'

NameError:
  uninitialized constant ActiveSupport::LoggerThreadSafeLevel::Logger
# ./vendor/bundle/ruby/2.6.0/gems/activesupport-6.1.7.10/lib/active_support/logger_thread_safe_level.rb:16:in `<module:LoggerThreadSafeLevel>'
# ./vendor/bundle/ruby/2.6.0/gems/activesupport-6.1.7.10/lib/active_support/logger_thread_safe_level.rb:9:in `<module:ActiveSupport>'
# ./vendor/bundle/ruby/2.6.0/gems/activesupport-6.1.7.10/lib/active_support/logger_thread_safe_level.rb:8:in `<top (required)>'
# ./vendor/bundle/ruby/2.6.0/gems/activesupport-6.1.7.10/lib/active_support/logger_silence.rb:5:in `require'
# ./vendor/bundle/ruby/2.6.0/gems/activesupport-6.1.7.10/lib/active_support/logger_silence.rb:5:in `<top (required)>'
# ./vendor/bundle/ruby/2.6.0/gems/activesupport-6.1.7.10/lib/active_support/logger.rb:3:in `require'
# ./vendor/bundle/ruby/2.6.0/gems/activesupport-6.1.7.10/lib/active_support/logger.rb:3:in `<top (required)>'
# ./vendor/bundle/ruby/2.6.0/gems/activesupport-6.1.7.10/lib/active_support.rb:29:in `require'
# ./vendor/bundle/ruby/2.6.0/gems/activesupport-6.1.7.10/lib/active_support.rb:29:in `<top (required)>'
# ./vendor/bundle/ruby/2.6.0/gems/carrierwave-3.0.7/lib/carrierwave/uploader/file_size.rb:1:in `require'
# ./vendor/bundle/ruby/2.6.0/gems/carrierwave-3.0.7/lib/carrierwave/uploader/file_size.rb:1:in `<top (required)>'
# ./vendor/bundle/ruby/2.6.0/gems/carrierwave-3.0.7/lib/carrierwave/uploader.rb:14:in `require'
# ./vendor/bundle/ruby/2.6.0/gems/carrierwave-3.0.7/lib/carrierwave/uploader.rb:14:in `<top (required)>'
# ./vendor/bundle/ruby/2.6.0/gems/carrierwave-3.0.7/lib/carrierwave.rb:97:in `require'
# ./vendor/bundle/ruby/2.6.0/gems/carrierwave-3.0.7/lib/carrierwave.rb:97:in `<top (required)>'
# ./spec/spec_helper.rb:7:in `require'
# ./spec/spec_helper.rb:7:in `<top (required)>'

This is because prior to 7.1, ActiveSupport was relying on concurrent-ruby to require the logger library, but concurrent-ruby stopped requiring logger starting in version 1.3.5.

This issue was fixed in rails/rails#54264.

The only place in carrierwave-mongoid that references Logger is here:

carrierwave-mongoid/spec/spec_helper.rb

Line 15 in 0f95a6c

Mongo::Logger.level = ::Logger::INFO

So, requiring logger in spec_helper.rb fixes the failing CI matrix configurations.