Bump zeitwerk from 2.6.6 to 2.6.8

[dependabot]

Bumps zeitwerk from 2.6.6 to 2.6.8.

Changelog

Sourced from zeitwerk's changelog.

2.6.8 (28 April 2023)

• The new Zeitwerk::Loader.for_gem_extension gives you a loader configured according to the conventions of a gem extension.

  Please check its documentation for further details.

2.6.7 (10 February 2023)

• Reset module state on Zeitwerk::NameError.

  If an autoload is triggered, the file is loaded successfully, but the expected constant does not get defined, Ruby resets the state of the module. In particular, autoload? returns nil for that constant name, and constants does not include the constant name (starting with Ruby 3.1).

  Zeitwerk is more strict, not defining the expected constant is an error condition and the loader raises Zeitwerk::NameError. But this happens during the require call and the exception prevents Ruby from doing that cleanup.

  With this change, the parent module is left in a state that makes more sense and is consistent with what Ruby does.

• A message is logged if an autoload did not define the expected constant.

  When that happens, Zeitwerk::NameError is raised and you normally see the exception. But if the error is shallowed, and you are inspecting the logs to investigate something, this new message may be helpful.

• By default, Zeitwerk::Loader#dirs filters ignored root directories out. Please, pass ignored: true if you want them included.

  It is very strange to configure a root directory and also ignore it, the edge case is supported only for completeness. However, in that case, client code listing root directories rarely needs the ignored ones.

• Documentation improvements.

• Enforcement of private interfaces continues with another gradual patch.

Commits

• c3c0ecb Ready for 2.6.8
• 814977d Edit the CHANGELOG
• ada579a s/dash/hyphen/g
• 8842758 More docs for for_gem_extension
• e07c1e5 README details
• 2536086 Document extended namespaces cannot be anonymous
• a50b394 Add argument validation to for_gem_extension
• dc32bf1 Rename _new → __new
• 341f19e Reword
• 5a36585 Typo
• Additional commits viewable in compare view

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