Update activesupport requirement from 4.1.6 to 6.0.0

[dependabot-preview]

Updates the requirements on activesupport to permit the latest version.

Changelog

Sourced from activesupport's changelog.

Rails 6.0.0 (August 16, 2019)

• Let require_dependency in zeitwerk mode look the autoload paths up for
  better backwards compatibility.

  Xavier Noria

• Let require_dependency in zeitwerk mode support arguments that respond
  to to_path for better backwards compatibility.

  Xavier Noria

• Make ActiveSupport::Logger Fiber-safe. Fixes #36752.

  Use Fiber.current.__id__ in ActiveSupport::Logger#local_level= in order
  to make log level local to Ruby Fibers in addition to Threads.

  Example:

  logger = ActiveSupport::Logger.new(STDOUT)
  logger.level = 1
  p "Main is debug? #{logger.debug?}"
  
  Fiber.new {
    logger.local_level = 0
    p "Thread is debug? #{logger.debug?}"
  }.resume
  
  p "Main is debug? #{logger.debug?}"
  

  Before:

  Main is debug? false
  Thread is debug? true
  Main is debug? true
  

  After:

  Main is debug? false
  Thread is debug? true
  Main is debug? false
  

  Alexander Varnin

• Do not delegate missing marshal_dump and _dump methods via the
  delegate_missing_to extension. This avoids unintentionally adding instance
  variables when calling Marshal.dump(object), should the delegation target of
  object be a method which would otherwise add them. Fixes #36522.

  Aaron Lipman

... (truncated)

Commits

• 66cabed Preparing for 6.0.0 release
• 83a7c02 Merge pull request #36825 from cpruitt/transliterate-frozen-us-ascii-strings
• c701e0b Improves compatibility of require_dependency in zeitwerk mode [Closes #36774]
• 79e9e68 Merge pull request #36702 from cpruitt/raise-on-transliterate-ascii-8bit
• a01665a let autoloaded? support modules with overridden names [closes #36757]
• ace28a5 Merge pull request #36753 from cmrd-senya/36752-make-rails-logger-fiber-safe
• 5574097 Merge pull request #36370 from ptoomey3/master
• 4f78062 Preparing for 6.0.0.rc2 release
• 056414e Omit marshal_dump & _dump from delegate_missing_to
• 3d2bdc1 Merge pull request #36700 from cpruitt/revert-36690-make-parameterize-require...
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #10.