Bump zeitwerk from 2.6.0 to 2.6.1#2

dependabot[bot] wants to merge 1 commit intomasterRubyOnWorld/slack-ruby-block-kit:masterfrom

dependabot/bundler/zeitwerk-2.6.1RubyOnWorld/slack-ruby-block-kit:dependabot/bundler/zeitwerk-2.6.1Copy head branch name to clipboard