Bump letter_opener from 1.8.1 to 1.9.0

Bumps [letter_opener](https://github.com/ryanb/letter_opener) from 1.8.1 to 1.9.0.
- [Changelog](https://github.com/ryanb/letter_opener/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ryanb/letter_opener/compare/v1.8.1...v1.9.0)

---
updated-dependencies:
- dependency-name: letter_opener
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -226,7 +226,7 @@ GEM
     language_server-protocol (3.17.0.3)
     launchy (2.5.2)
       addressable (~> 2.8)
-    letter_opener (1.8.1)
+    letter_opener (1.9.0)
       launchy (>= 2.2, < 3)
     listen (3.8.0)
       rb-fsevent (~> 0.10, >= 0.10.3)