Bump middleman from 4.3.11 to 4.4.0 (#401)

Bumps [middleman](https://github.com/middleman/middleman) from 4.3.11 to 4.4.0.
- [Release notes](https://github.com/middleman/middleman/releases)
- [Changelog](https://github.com/middleman/middleman/blob/v4.4.0/CHANGELOG.md)
- [Commits](https://github.com/middleman/middleman/compare/v4.3.11...v4.4.0)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile

@@ -1,7 +1,7 @@
 source "https://rubygems.org"
 
 gem "addressable"
-gem "middleman", "~> 4.3.11"
+gem "middleman", "~> 4.4.0"
 gem "middleman-autoprefixer"
 gem "middleman-blog"
 gem "middleman-livereload"

Gemfile.lock

@@ -1,11 +1,12 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (5.2.6)
+    activesupport (6.1.4)
       concurrent-ruby (~> 1.0, >= 1.0.2)
-      i18n (>= 0.7, < 2)
+      i18n (>= 1.6, < 2)
-      minitest (~> 5.1)
+      minitest (>= 5.1)
-      tzinfo (~> 1.1)
+      tzinfo (~> 2.0)
+      zeitwerk (~> 2.3)
     addressable (2.8.0)
       public_suffix (>= 2.0.2, < 5.0)
     autoprefixer-rails (10.2.5.0)
@@ -16,7 +17,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.1.8)
+    concurrent-ruby (1.1.9)
     contracts (0.13.0)
     dotenv (2.7.6)
     em-websocket (0.5.2)
@@ -25,10 +26,10 @@ GEM
     erubis (2.7.0)
     eventmachine (1.2.7)
     execjs (2.7.0)
-    fast_blank (1.0.0)
+    fast_blank (1.0.1)
-    fastimage (2.2.3)
+    fastimage (2.2.5)
-    ffi (1.15.0)
+    ffi (1.15.3)
-    haml (5.2.1)
+    haml (5.2.2)
       temple (>= 0.8.0)
       tilt
     hamster (3.0.0)
@@ -36,7 +37,7 @@ GEM
     hashie (3.6.0)
     htmlcompressor (0.2.0)
     http_parser.rb (0.6.0)
-    i18n (0.9.5)
+    i18n (1.6.0)
       concurrent-ruby (~> 1.0)
     kramdown (2.3.1)
       rexml
@@ -45,12 +46,12 @@ GEM
       rb-inotify (~> 0.9, >= 0.9.7)
     memoist (0.16.2)
     method_source (1.0.0)
-    middleman (4.3.11)
+    middleman (4.4.0)
       coffee-script (~> 2.2)
       haml (>= 4.0.5)
       kramdown (>= 2.3.0)
-      middleman-cli (= 4.3.11)
+      middleman-cli (= 4.4.0)
-      middleman-core (= 4.3.11)
+      middleman-core (= 4.4.0)
     middleman-autoprefixer (3.0.0)
       autoprefixer-rails (~> 10.0)
       middleman-core (>= 4.0.0)
@@ -58,13 +59,13 @@ GEM
       addressable (~> 2.3)
       middleman-core (>= 4.0.0)
       tzinfo (>= 0.3.0)
-    middleman-cli (4.3.11)
+    middleman-cli (4.4.0)
       thor (>= 0.17.0, < 2.0)
-    middleman-core (4.3.11)
+    middleman-core (4.4.0)
-      activesupport (>= 4.2, < 6.0)
+      activesupport (>= 6.1, < 7.0)
-      addressable (~> 2.3)
+      addressable (~> 2.4)
       backports (~> 3.6)
-      bundler
+      bundler (~> 2.0)
       contracts (~> 0.13.0)
       dotenv
       erubis
@@ -73,16 +74,18 @@ GEM
       fastimage (~> 2.0)
       hamster (~> 3.0)
       hashie (~> 3.4)
-      i18n (~> 0.9.0)
+      i18n (~> 1.6.0)
       listen (~> 3.0.0)
       memoist (~> 0.14)
-      padrino-helpers (~> 0.13.0)
+      padrino-helpers (~> 0.15.0)
       parallel
       rack (>= 1.4.5, < 3)
       sassc (~> 2.0)
       servolux
       tilt (~> 2.0.9)
+      toml
       uglifier (~> 3.0)
+      webrick
     middleman-gh-pages (0.4.1)
       rake (> 0.9.3)
     middleman-livereload (3.4.7)
@@ -96,13 +99,13 @@ GEM
       middleman-core (>= 3.2)
       rouge (~> 3.2)
     minitest (5.14.4)
-    padrino-helpers (0.13.3.4)
+    padrino-helpers (0.15.1)
-      i18n (~> 0.6, >= 0.6.7)
+      i18n (>= 0.6.7, < 2)
-      padrino-support (= 0.13.3.4)
+      padrino-support (= 0.15.1)
       tilt (>= 1.4.1, < 3)
-    padrino-support (0.13.3.4)
+    padrino-support (0.15.1)
-      activesupport (>= 3.1)
     parallel (1.20.1)
+    parslet (2.0.0)
     pry (0.14.1)
       coderay (~> 1.1)
       method_source (~> 1.0)
@@ -122,19 +125,22 @@ GEM
     servolux (0.13.0)
     temple (0.8.2)
     thor (1.1.0)
-    thread_safe (0.3.6)
     tilt (2.0.10)
-    tzinfo (1.2.9)
+    toml (0.3.0)
-      thread_safe (~> 0.1)
+      parslet (>= 1.8.0, < 3.0.0)
+    tzinfo (2.0.4)
+      concurrent-ruby (~> 1.0)
     uglifier (3.2.0)
       execjs (>= 0.3.0, < 3)
+    webrick (1.7.0)
+    zeitwerk (2.4.2)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
   addressable
-  middleman (~> 4.3.11)
+  middleman (~> 4.4.0)
   middleman-autoprefixer
   middleman-blog
   middleman-gh-pages