Bump erb from 4.0.2 to 4.0.4

[dependabot[bot]]

Bumps erb from 4.0.2 to 4.0.4.

Changelog

Sourced from erb's changelog.

4.0.4

• Skip building the C extension for JRuby #52

4.0.3

• Enable frozen_string_literal in all files #49

Commits

• b68bfed Version 4.0.4
• f0f68ba Skip building a native extension for JRuby
• 8db8b8b Use test-unit-ruby-core gem (#51)
• a9a8366 Bump actions/checkout from 3 to 4 (#50)
• c594f2f Version 4.0.3
• b7e45c2 Enable frozen_string_literal in all files (#49)
• 3d3df5c Update test libraries from https://github.com/ruby/ruby/commit/b4e438d8aabaf4...
• 8ba8bb7 [DOC] Use indented heredoc
• a0d5b24 Use ruby/actions/.github/workflows/ruby_versions.yml@master (#46)
• 44222f1 Migrate set-output to $GITHUB_OUTPUT #17 (#44)
• Additional commits viewable in compare view

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