Update dependency jekyll-seo-tag to v2.9.0

Author: renovate[bot]

Gemfile.lock

@@ -12,8 +12,8 @@ GEM
       minitest (>= 5.1)
       securerandom (>= 0.3)
       tzinfo (~> 2.0, >= 2.0.5)
-    addressable (2.8.7)
-      public_suffix (>= 2.0.2, < 7.0)
+    addressable (2.9.0)
+      public_suffix (>= 2.0.2, < 8.0)
     base64 (0.2.0)
     bigdecimal (3.1.8)
     coffee-script (2.4.1)
@@ -22,9 +22,9 @@ GEM
     coffee-script-source (1.12.2)
     colorator (1.1.0)
     commonmarker (0.23.10)
-    concurrent-ruby (1.3.4)
+    concurrent-ruby (1.3.8)
     connection_pool (2.4.1)
-    csv (3.3.0)
+    csv (3.3.6)
     dnsruby (1.72.2)
       simpleidn (~> 0.2.1)
     drb (2.2.1)
@@ -41,7 +41,7 @@ GEM
       logger
     faraday-net_http (3.3.0)
       net-http
-    ffi (1.17.0)
+    ffi (1.17.4)
     forwardable-extended (2.6.0)
     gemoji (4.1.0)
     github-pages (232)
@@ -99,8 +99,8 @@ GEM
     html-pipeline (2.14.3)
       activesupport (>= 2)
       nokogiri (>= 1.4)
-    http_parser.rb (0.8.0)
-    i18n (1.14.6)
+    http_parser.rb (0.8.1)
+    i18n (1.15.2)
       concurrent-ruby (~> 1.0)
     jekyll (3.10.0)
       addressable (~> 2.4)
@@ -218,7 +218,8 @@ GEM
     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 (1.6.1)
@@ -244,7 +245,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
-    rexml (3.3.7)
+    rexml (3.4.4)
     rouge (3.30.0)
     rubyzip (2.3.2)
     safe_yaml (1.0.5)
@@ -266,7 +267,7 @@ GEM
       concurrent-ruby (~> 1.0)
     unicode-display_width (1.8.0)
     uri (0.13.1)
-    webrick (1.8.2)
+    webrick (1.9.2)
 
 PLATFORMS
   ruby