Remove redundant :: prefix in .irbrc

[Copilot]

Fixes RuboCop Style/RedundantConstantBase offense at .irbrc:4:13.

Changes

• Remove :: prefix from Bundler constant lookup - unnecessary since Ruby searches top-level namespace by default
• Add vendor/bundle and .bundle to .gitignore

# Before
if defined?(::Bundler)

# After
if defined?(Bundler)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Remove redundant ::</issue_title> <issue_description>237 .irbrc:4:13: C: [Correctable] Style/RedundantConstantBase: Remove redundant ::. 238 if defined?(::Bundler)</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes benbalter/dotfiles#51

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