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] <[email protected]>

Gemfile.lock

@@ -126,7 +126,7 @@ GEM
       warden (~> 1.2.3)
     diff-lcs (1.5.1)
     domain_name (0.6.20240107)
-    dotenv (3.1.4)
+    dotenv (3.1.7)
     drb (2.2.1)
     dry-cli (1.2.0)
     ed25519 (1.3.0)
@@ -179,7 +179,7 @@ GEM
       actionview (>= 5.0.0)
       activesupport (>= 5.0.0)
     jmespath (1.6.2)
-    kamal (2.3.0)
+    kamal (2.4.0)
       activesupport (>= 7.0)
       base64 (~> 0.2)
       bcrypt_pbkdf (~> 1.0)