Replace deprecated require_dependency with require in preview loading

[Copilot]

require_dependency was removed in Rails 7.1+ as part of the Zeitwerk-only autoloading transition. Its use in preview loading causes errors in modern Rails apps.

Changes

• lib/view_component/preview.rb: Replace require_dependency with require in __vc_load_previews

# Before
Dir["#{preview_path}/**/*preview.rb"].sort.each { |file| require_dependency file }

# After
Dir["#{preview_path}/**/*preview.rb"].sort.each { |file| require file }

• docs/CHANGELOG.md: Add entry under main

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[joelhawksley]

@copilot please try again