Merge pull request #8 from slack-ruby/dependabot/bundler/nokogiri-1.13.3

Bump nokogiri from 1.12.5 to 1.13.3

Author: dblock

Gemfile.lock

@@ -104,7 +104,7 @@ GEM
       mime-types-data (~> 3.2015)
     mime-types-data (3.2020.0425)
     mini_mime (1.0.2)
-    mini_portile2 (2.6.1)
+    mini_portile2 (2.8.0)
     minitest (5.14.0)
     mongo (2.12.1)
       bson (>= 4.8.2, < 5.0.0)
@@ -130,11 +130,11 @@ GEM
       slack-ruby-bot (>= 0.10.5)
     newrelic_rpm (6.10.0.364)
     nio4r (2.5.2)
-    nokogiri (1.12.5)
-      mini_portile2 (~> 2.6.1)
+    nokogiri (1.13.3)
+      mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     public_suffix (4.0.6)
-    racc (1.5.2)
+    racc (1.6.0)
     rack (2.2.3)
     rack-accept (0.4.5)
       rack (>= 0.4)