Bump capistrano from 3.16.0 to 3.18.0

Bumps [capistrano](https://github.com/capistrano/capistrano) from 3.16.0 to 3.18.0.
- [Release notes](https://github.com/capistrano/capistrano/releases)
- [Commits](capistrano/capistrano@v3.16.0...v3.18.0)

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

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

Gemfile

@@ -53,7 +53,7 @@ gem 'dalli'
 gem 'progress_bar'
 
 group :deploy do
-  gem 'capistrano', '~> 3.16'
+  gem 'capistrano', '~> 3.18'
   gem 'capistrano-rvm'
   gem 'capistrano-rails', '~> 1.6'
   gem 'capistrano-passenger'

Gemfile.lock

@@ -65,7 +65,7 @@ GEM
       activerecord (>= 4.2)
     addressable (2.8.1)
       public_suffix (>= 2.0.2, < 6.0)
-    airbrussh (1.4.0)
+    airbrussh (1.5.1)
       sshkit (>= 1.6.1, != 1.7.0)
     arel (9.0.0)
     autoprefixer-rails (7.2.2)
@@ -80,7 +80,7 @@ GEM
     bcrypt (3.1.16)
     bcrypt_pbkdf (1.1.0)
     builder (3.2.4)
-    capistrano (3.16.0)
+    capistrano (3.18.0)
       airbrussh (>= 1.0.0)
       i18n
       rake (>= 10.0.0)
@@ -124,7 +124,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.2.0)
+    concurrent-ruby (1.2.3)
     crack (0.4.5)
       rexml
     crass (1.0.6)
@@ -214,7 +214,7 @@ GEM
     http-accept (1.7.0)
     http-cookie (1.0.3)
       domain_name (~> 0.5)
-    i18n (1.12.0)
+    i18n (1.14.1)
       concurrent-ruby (~> 1.0)
     i18n-js (3.9.1)
       i18n (>= 0.6.6)
@@ -248,11 +248,14 @@ GEM
       ruby2_keywords (~> 0.0.1)
     mustermann-grape (1.0.1)
       mustermann (>= 1.0.0)
+    mutex_m (0.2.0)
     mysql2 (0.5.2)
     net-ldap (0.17.0)
-    net-scp (3.0.0)
-      net-ssh (>= 2.6.5, < 7.0.0)
-    net-ssh (6.1.0)
+    net-scp (4.0.0)
+      net-ssh (>= 2.6.5, < 8.0.0)
+    net-sftp (4.0.0)
+      net-ssh (>= 5.0.0, < 8.0.0)
+    net-ssh (7.2.1)
     netrc (0.11.0)
     nio4r (2.5.8)
     nokogiri (1.13.10)
@@ -332,7 +335,7 @@ GEM
       method_source
       rake (>= 0.8.7)
       thor (>= 0.19.0, < 2.0)
-    rake (13.0.6)
+    rake (13.1.0)
     rdoc (6.3.3)
     regexp_parser (2.5.0)
     remotipart (1.4.4)
@@ -411,8 +414,10 @@ GEM
       actionpack (>= 4.0)
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)
-    sshkit (1.21.2)
+    sshkit (1.22.0)
+      mutex_m
       net-scp (>= 1.1.2)
+      net-sftp (>= 2.1.2)
       net-ssh (>= 2.8.0)
     temple (0.8.1)
     terrapin (0.6.0)
@@ -469,7 +474,7 @@ DEPENDENCIES
   babel-transpiler
   bcrypt_pbkdf
   bundler (= 2.4.22)
-  capistrano (~> 3.16)
+  capistrano (~> 3.18)
   capistrano-passenger
   capistrano-rails (~> 1.6)
   capistrano-rvm