Update middleman, downgrade contracts

Gemfile

@@ -1,7 +1,7 @@
 source "https://rubygems.org"
 
 gem "addressable"
-gem "middleman", "~> 4.5.0"
+gem "middleman", "~> 4.5.1"
 gem "middleman-autoprefixer"
 gem "middleman-blog"
 gem "middleman-livereload"

Gemfile.lock

@@ -17,7 +17,7 @@ GEM
       execjs
     coffee-script-source (1.12.2)
     concurrent-ruby (1.2.3)
-    contracts (0.17)
+    contracts (0.16.1)
     dotenv (2.8.1)
     em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
@@ -48,27 +48,27 @@ GEM
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     memoist (0.16.2)
-    middleman (4.5.0)
+    middleman (4.5.1)
       coffee-script (~> 2.2)
       haml (>= 4.0.5)
       kramdown (>= 2.3.0)
-      middleman-cli (= 4.5.0)
-      middleman-core (= 4.5.0)
+      middleman-cli (= 4.5.1)
+      middleman-core (= 4.5.1)
     middleman-autoprefixer (3.0.0)
       autoprefixer-rails (~> 10.0)
       middleman-core (>= 4.0.0)
     middleman-blog (4.0.3)
       addressable (~> 2.3)
       middleman-core (>= 4.0.0)
       tzinfo (>= 0.3.0)
-    middleman-cli (4.5.0)
-      thor (>= 0.17.0, < 2.0)
-    middleman-core (4.5.0)
+    middleman-cli (4.5.1)
+      thor (>= 0.17.0, < 1.3.0)
+    middleman-core (4.5.1)
       activesupport (>= 6.1, < 7.1)
       addressable (~> 2.4)
       backports (~> 3.6)
       bundler (~> 2.0)
-      contracts (~> 0.13)
+      contracts (~> 0.13, < 0.17)
       dotenv
       erubis
       execjs (~> 2.0)
@@ -158,7 +158,7 @@ GEM
       lint_roller (~> 1.1)
       rubocop-performance (~> 1.20.2)
     temple (0.10.3)
-    thor (1.3.0)
+    thor (1.2.2)
     tilt (2.0.11)
     toml (0.3.0)
       parslet (>= 1.8.0, < 3.0.0)
@@ -174,7 +174,7 @@ PLATFORMS
 
 DEPENDENCIES
   addressable
-  middleman (~> 4.5.0)
+  middleman (~> 4.5.1)
   middleman-autoprefixer
   middleman-blog
   middleman-gh-pages