Lock file maintenance

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Gemfile.lock

@@ -1,21 +1,21 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.8.8)
+    addressable (2.9.0)
       public_suffix (>= 2.0.2, < 8.0)
     base64 (0.3.0)
     bigdecimal (4.1.2)
     colorator (1.1.0)
-    concurrent-ruby (1.3.6)
+    concurrent-ruby (1.3.7)
     csv (3.3.5)
     em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0)
     eventmachine (1.2.7)
-    ffi (1.17.2)
+    ffi (1.17.4)
     forwardable-extended (2.6.0)
-    http_parser.rb (0.8.0)
-    i18n (1.14.7)
+    http_parser.rb (0.8.1)
+    i18n (1.15.2)
       concurrent-ruby (~> 1.0)
     jekyll (3.10.0)
       addressable (~> 2.4)
@@ -42,19 +42,20 @@ GEM
       jekyll (>= 3.7, < 5.0)
     jekyll-watch (2.2.1)
       listen (~> 3.0)
-    kramdown (2.4.0)
-      rexml
+    kramdown (2.5.2)
+      rexml (>= 3.4.4)
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
     liquid (4.0.4)
-    listen (3.9.0)
+    listen (3.10.0)
+      logger
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     logger (1.7.0)
     mercenary (0.3.6)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    public_suffix (5.1.1)
+    public_suffix (7.0.5)
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)