Bump letter_opener_web from 1.3.4 to 1.4.0
Bump letter_opener_web from 1.3.4 to 1.4.0

Bumps [letter_opener_web](https://github.com/fgrehm/letter_opener_web) from 1.3.4 to 1.4.0.
- [Release notes](https://github.com/fgrehm/letter_opener_web/releases)
- [Changelog](https://github.com/fgrehm/letter_opener_web/blob/master/CHANGELOG.md)
- [Commits](https://github.com/fgrehm/letter_opener_web/compare/v1.3.4...v1.4.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
ProgrammingDaisukiClub/WPCS2,ProgrammingDaisukiClub/WPCS2,ProgrammingDaisukiClub/WPCS2,ProgrammingDaisukiClub/WPCS2,ProgrammingDaisukiClub/WPCS2