Bump middleman from 4.5.0 to 4.5.1 in /railseventstore.org

Bumps [middleman](https://github.com/middleman/middleman) from 4.5.0 to 4.5.1.
- [Changelog](https://github.com/middleman/middleman/blob/main/CHANGELOG.md)
- [Commits](https://github.com/middleman/middleman/commits)

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

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

railseventstore.org/Gemfile.lock

@@ -18,10 +18,10 @@ GEM
       execjs
     coffee-script-source (1.12.2)
     concurrent-ruby (1.2.2)
-    contracts (0.17)
+    contracts (0.16.1)
     dotenv (2.8.1)
     erubis (2.7.0)
-    execjs (2.8.1)
+    execjs (2.9.1)
     faraday (2.7.11)
       base64
       faraday-net_http (>= 2.0, < 3.1)
@@ -31,7 +31,7 @@ GEM
       faraday (~> 2.0)
     fast_blank (1.0.1)
     fastimage (2.2.7)
-    ffi (1.15.5)
+    ffi (1.16.3)
     haml (5.2.2)
       temple (>= 0.8.0)
       tilt
@@ -46,22 +46,22 @@ 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-aria_current (0.1.2)
       middleman-core (~> 4.0)
-    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)
@@ -110,7 +110,7 @@ GEM
       addressable (>= 2.3.5)
       faraday (>= 0.17.3, < 3)
     servolux (0.13.0)
-    temple (0.10.2)
+    temple (0.10.3)
     thor (1.2.2)
     tilt (2.0.11)
     toml (0.3.0)