Bump middleman from 4.3.2 to 4.3.3

Bumps [middleman](https://github.com/middleman/middleman) from 4.3.2 to 4.3.3.
- [Release notes](https://github.com/middleman/middleman/releases)
- [Changelog](https://github.com/middleman/middleman/blob/v4.3.3/CHANGELOG.md)
- [Commits](middleman/middleman@v4.3.2...v4.3.3)

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

Gemfile.lock

@@ -77,22 +77,22 @@ GEM
       rb-inotify (~> 0.9, >= 0.9.7)
     memoist (0.16.0)
     method_source (0.9.2)
-    middleman (4.3.2)
+    middleman (4.3.3)
       coffee-script (~> 2.2)
       haml (>= 4.0.5)
       kramdown (~> 1.2)
-      middleman-cli (= 4.3.2)
-      middleman-core (= 4.3.2)
+      middleman-cli (= 4.3.3)
+      middleman-core (= 4.3.3)
     middleman-blog (4.0.2)
       addressable (~> 2.3)
       middleman-core (~> 4.0)
       tzinfo (>= 0.3.0)
-    middleman-cli (4.3.2)
+    middleman-cli (4.3.3)
       thor (>= 0.17.0, < 2.0)
     middleman-compass (4.0.1)
       compass (>= 1.0.0, < 2.0.0)
       middleman-core (>= 4.0.0)
-    middleman-core (4.3.2)
+    middleman-core (4.3.3)
       activesupport (>= 4.2, < 5.1)
       addressable (~> 2.3)
       backports (~> 3.6)
@@ -145,7 +145,7 @@ GEM
       tilt (>= 1.4.1, < 3)
     padrino-support (0.13.3.4)
       activesupport (>= 3.1)
-    parallel (1.12.1)
+    parallel (1.13.0)
     pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)