build: update gemfile

Gemfile.lock

@@ -10,8 +10,8 @@ GEM
       http_parser.rb (~> 0.6.0)
     eventmachine (1.2.7)
     eventmachine (1.2.7-x64-mingw32)
-    ffi (1.15.3)
+    ffi (1.15.4)
-    ffi (1.15.3-x64-mingw32)
+    ffi (1.15.4-x64-mingw32)
     forwardable-extended (2.6.0)
     http_parser.rb (0.6.0)
     i18n (1.8.10)
@@ -44,7 +44,7 @@ GEM
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
     liquid (4.0.3)
-    listen (3.5.1)
+    listen (3.7.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.4.0)
@@ -55,7 +55,7 @@ GEM
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rexml (3.2.5)
-    rouge (3.26.0)
+    rouge (3.26.1)
     safe_yaml (1.0.5)
     sassc (2.4.0)
       ffi (~> 1.9)
@@ -67,7 +67,7 @@ GEM
       concurrent-ruby (~> 1.0)
     tzinfo-data (1.2021.1)
       tzinfo (>= 1.0.0)
-    unicode-display_width (1.7.0)
+    unicode-display_width (1.8.0)
     webrick (1.7.0)
 
 PLATFORMS
@@ -82,4 +82,4 @@ DEPENDENCIES
   webrick (~> 1.7)
 
 BUNDLED WITH
-   2.2.21
+   2.2.22