Bump middleman from 4.4.3 to 4.5.0 in /railseventstore.org

Bumps [middleman](https://github.com/middleman/middleman) from 4.4.3 to 4.5.0.
- [Release notes](https://github.com/middleman/middleman/releases)
- [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]>

Author: dependabot[bot]

railseventstore.org/Gemfile

@@ -2,7 +2,7 @@
 
 source "https://rubygems.org"
 
-gem "middleman", "~> 4.4"
+gem "middleman", "~> 4.5"
 gem "middleman-aria_current"
 gem "middleman-syntax"
 gem "redcarpet"

railseventstore.org/Gemfile.lock

@@ -6,18 +6,18 @@ GEM
       i18n (>= 1.6, < 2)
       minitest (>= 5.1)
       tzinfo (~> 2.0)
-    addressable (2.8.3)
+    addressable (2.8.4)
       public_suffix (>= 2.0.2, < 6.0)
     arbre (1.5.0)
       activesupport (>= 3.0.0, < 7.1)
       ruby2_keywords (>= 0.0.2, < 1.0)
-    backports (3.24.0)
+    backports (3.24.1)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
     concurrent-ruby (1.2.2)
-    contracts (0.16.1)
+    contracts (0.17)
     dotenv (2.8.1)
     erubis (2.7.0)
     execjs (2.8.1)
@@ -44,17 +44,17 @@ GEM
       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-aria_current (0.1.2)
       middleman-core (~> 4.0)
-    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)
@@ -91,10 +91,10 @@ GEM
       padrino-support (= 0.15.3)
       tilt (>= 1.4.1, < 3)
     padrino-support (0.15.3)
-    parallel (1.22.1)
+    parallel (1.23.0)
     parslet (2.0.0)
     public_suffix (5.0.1)
-    rack (2.2.6.4)
+    rack (2.2.7)
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
@@ -130,7 +130,7 @@ DEPENDENCIES
   faraday
   faraday-retry
   haml (< 6)
-  middleman (~> 4.4)
+  middleman (~> 4.5)
   middleman-aria_current
   middleman-syntax
   octokit