Revert changes to Gemfile.lock

These changes were only present because of using an arm64 build of ruby 2.6.4. Using an x86_64 build removes the changes.

Author: joshheald

Gemfile.lock

@@ -236,7 +236,6 @@ GEM
     memoist (0.16.2)
     mini_magick (4.11.0)
     mini_mime (1.1.1)
-    mini_portile2 (2.6.1)
     minitest (5.14.4)
     molinillo (0.6.6)
     multi_json (1.15.0)
@@ -245,9 +244,6 @@ GEM
     nap (1.1.0)
     naturally (2.2.1)
     netrc (0.11.0)
-    nokogiri (1.12.2)
-      mini_portile2 (~> 2.6.1)
-      racc (~> 1.4)
     nokogiri (1.12.2-x86_64-darwin)
       racc (~> 1.4)
     octokit (4.21.0)
@@ -332,7 +328,6 @@ GEM
     xctest_list (1.2.1)
 
 PLATFORMS
-  -darwin-20
   x86_64-darwin-19
   x86_64-darwin-20