Bump middleman from 4.4.3 to 4.5.0

Bumps [middleman](https://github.com/middleman/middleman) from 4.4.3 to 4.5.0.
- [Changelog](https://github.com/middleman/middleman/blob/main/CHANGELOG.md)
- [Commits](https://github.com/middleman/middleman/commits/v4.5.0)

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

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

Gemfile.lock

@@ -31,8 +31,9 @@ GEM
     fast_blank (1.0.1)
     fastimage (2.2.7)
     ffi (1.15.5)
-    haml (5.2.2)
-      temple (>= 0.8.0)
+    haml (6.1.1)
+      temple (>= 0.8.2)
+      thor
       tilt
     hamster (3.0.0)
       concurrent-ruby (~> 1.0)
@@ -42,22 +43,22 @@ GEM
       concurrent-ruby (~> 1.0)
     kramdown (2.4.0)
       rexml
-    listen (3.7.1)
+    listen (3.8.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     memoist (0.16.2)
-    middleman (4.4.3)
+    middleman (4.5.0)
       coffee-script (~> 2.2)
-      haml (>= 4.0.5, < 6.0)
+      haml (>= 4.0.5)
       kramdown (>= 2.3.0)
-      middleman-cli (= 4.4.3)
-      middleman-core (= 4.4.3)
+      middleman-cli (= 4.5.0)
+      middleman-core (= 4.5.0)
     middleman-autoprefixer (3.0.0)
       autoprefixer-rails (~> 10.0)
       middleman-core (>= 4.0.0)
-    middleman-cli (4.4.3)
+    middleman-cli (4.5.0)
       thor (>= 0.17.0, < 2.0)
-    middleman-core (4.4.3)
+    middleman-core (4.5.0)
       activesupport (>= 6.1, < 7.1)
       addressable (~> 2.4)
       backports (~> 3.6)