Bump kamal from 2.7.0 to 2.8.0

Bumps [kamal](https://github.com/basecamp/kamal) from 2.7.0 to 2.8.0.
- [Release notes](https://github.com/basecamp/kamal/releases)
- [Commits](basecamp/kamal@v2.7.0...v2.8.0)

---
updated-dependencies:
- dependency-name: kamal
  dependency-version: 2.8.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Gemfile.lock

@@ -80,7 +80,7 @@ GEM
     bcrypt (3.1.20)
     bcrypt_pbkdf (1.1.1)
     benchmark (0.4.1)
-    bigdecimal (3.3.0)
+    bigdecimal (3.3.1)
     bindex (0.8.1)
     bootsnap (1.18.6)
       msgpack (~> 1.2)
@@ -144,7 +144,7 @@ GEM
       railties (>= 5)
       sorbet-runtime
     json (2.15.1)
-    kamal (2.7.0)
+    kamal (2.8.0)
       activesupport (>= 7.0)
       base64 (~> 0.2)
       bcrypt_pbkdf (~> 1.0)