Bump letter_opener from 1.8.1 to 1.9.0

[dependabot[bot]]

Bumps letter_opener from 1.8.1 to 1.9.0.

Changelog

Sourced from letter_opener's changelog.

1.9.0

• Store mail location in Mail::Message object (thanks Jonathan Chan)
• Drop Ruby 2 support. Support only Ruby 3.0+
• Remove nkf gem dependency.

Commits

• 3a19eff Bump version.
• 2f2cd8d Update CHANGELOG.md
• cffc6a7 Remove nkf dependency.
• 962b1d6 Update Changelog.
• ae620be Remove Rails 2.3 fork mention
• 1b9611f added functionality to get letter opener save location from the mail (#207)
• a2f5919 Bump actions/checkout (#209)
• 092ba11 Fix Ruby 3.3 bundled gem warning (#208)
• 33f0989 Drop Ruby 2 support.
• f87f8bf Merge pull request #205 from petergoldstein/feature/add_ruby_3_2_to_ci
• Additional commits viewable in compare view

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