Bump kamal from 2.3.0 to 2.4.0

Bumps [kamal](https://github.com/basecamp/kamal) from 2.3.0 to 2.4.0.
- [Release notes](https://github.com/basecamp/kamal/releases)
- [Commits](basecamp/kamal@v2.3.0...v2.4.0)

---
updated-dependencies:
- dependency-name: kamal
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -255,7 +255,7 @@ GEM
       activesupport (>= 5.0.0)
     jmespath (1.6.2)
     json (2.9.1)
-    kamal (2.3.0)
+    kamal (2.4.0)
       activesupport (>= 7.0)
       base64 (~> 0.2)
       bcrypt_pbkdf (~> 1.0)