chore(deps-dev): bump letter_opener_web from 2.0.0 to 3.0.0

[dependabot[bot]]

Bumps letter_opener_web from 2.0.0 to 3.0.0.

Changelog

Sourced from letter_opener_web's changelog.

3.0.0

Breaking

• Drop EoL'd Rubies and Rails - now requires Ruby 3.1+ and Rails 6.1+.

Changes

• Reliably strip Attachment links from the sidebar. #132

Additions

• Allow dot (.) character in attachment file names. #131
• Add dark mode. #119

Commits

• 84eec29 Bump to v3.0.0
• 7d10b4a Drop old Rubies/Rails
• b2a214d Add CHANGELOG entry for Dark mode
• ce3e77f Change style when in dark mode.
• af99799 Allow a dot (.) in the attachment file name
• 3e38980 Add binstubs
• 1c5cd10 Strip Attachment elements from sidebar
• 1583a7b Remove unused shoulda-matchers
• 7b48f8a Split linting and specs
• 035c1cb Remove Codecov for now
• Additional commits viewable in compare view

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