Bump zeitwerk from 2.6.7 to 2.6.8

[dependabot[bot]]

Bumps zeitwerk from 2.6.7 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.

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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[codecov[bot]]

Codecov Report

Merging #168 (84df80f) into master (c0f2dad) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #168   +/-   ##
=======================================
  Coverage   99.14%   99.14%           
=======================================
  Files          45       45           
  Lines         938      938           
=======================================
  Hits          930      930           
  Misses          8        8           

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