chore(deps-dev): 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

@@ -383,9 +383,9 @@ GEM
     knapsack_pro (6.0.4)
       rake
     language_server-protocol (3.17.0.3)
-    launchy (2.5.0)
-      addressable (~> 2.7)
-    letter_opener (1.8.1)
+    launchy (2.5.2)
+      addressable (~> 2.8)
+    letter_opener (1.9.0)
       launchy (>= 2.2, < 3)
     link_header (0.0.8)
     listen (3.8.0)