Bump kamal from 2.5.3 to 2.8.1

Bumps [kamal](https://github.com/basecamp/kamal) from 2.5.3 to 2.8.1.
- [Release notes](https://github.com/basecamp/kamal/releases)
- [Commits](basecamp/kamal@v2.5.3...v2.8.1)

---
updated-dependencies:
- dependency-name: kamal
  dependency-version: 2.8.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -73,26 +73,26 @@ GEM
       tzinfo (~> 2.0, >= 2.0.5)
       uri (>= 0.13.1)
     ast (2.4.3)
-    base64 (0.2.0)
+    base64 (0.3.0)
     bcrypt_pbkdf (1.1.1)
-    benchmark (0.4.0)
-    bigdecimal (3.1.9)
+    benchmark (0.4.1)
+    bigdecimal (3.3.1)
     bindex (0.8.1)
     bootsnap (1.18.4)
       msgpack (~> 1.2)
     brakeman (7.0.0)
       racc
     builder (3.3.0)
     concurrent-ruby (1.3.5)
-    connection_pool (2.5.0)
+    connection_pool (2.5.4)
     crass (1.0.6)
     date (3.4.1)
     debug (1.10.0)
       irb (~> 1.10)
       reline (>= 0.3.8)
-    dotenv (3.1.7)
-    drb (2.2.1)
-    ed25519 (1.3.0)
+    dotenv (3.1.8)
+    drb (2.2.3)
+    ed25519 (1.4.0)
     erubi (1.13.1)
     et-orbi (1.2.11)
       tzinfo
@@ -127,13 +127,13 @@ GEM
       rdoc (>= 4.0.0)
       reline (>= 0.4.2)
     json (2.10.2)
-    kamal (2.5.3)
+    kamal (2.8.1)
       activesupport (>= 7.0)
       base64 (~> 0.2)
       bcrypt_pbkdf (~> 1.0)
       concurrent-ruby (~> 1.2)
       dotenv (~> 3.1)
-      ed25519 (~> 1.2)
+      ed25519 (~> 1.4)
       net-ssh (~> 7.3)
       sshkit (>= 1.23.0, < 2.0)
       thor (~> 1.3)
@@ -157,7 +157,7 @@ GEM
       benchmark
       logger
     mini_mime (1.1.5)
-    minitest (5.25.5)
+    minitest (5.26.0)
     msgpack (1.8.0)
     net-imap (0.5.6)
       date
@@ -188,7 +188,7 @@ GEM
       racc (~> 1.4)
     nokogiri (1.18.7-x86_64-linux-musl)
       racc (~> 1.4)
-    ostruct (0.6.1)
+    ostruct (0.6.3)
     parallel (1.26.3)
     parser (3.3.7.4)
       ast (~> 2.4.1)
@@ -345,7 +345,7 @@ GEM
     unicode-display_width (3.1.4)
       unicode-emoji (~> 4.0, >= 4.0.4)
     unicode-emoji (4.0.4)
-    uri (1.0.3)
+    uri (1.0.4)
     useragent (0.16.11)
     web-console (4.2.1)
       actionview (>= 6.0.0)
@@ -356,7 +356,7 @@ GEM
       base64
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)
-    zeitwerk (2.7.2)
+    zeitwerk (2.7.3)
 
 PLATFORMS
   aarch64-linux