Update sketch-beta to 43,38963 (#3434)

Casks/sketch-beta.rb

@@ -1,11 +1,11 @@
 cask 'sketch-beta' do
-  version '43,38917'
-  sha256 'cb611bc3b72ef44b8132c5dca441d4c357b226b976abd8ed215f943bf20810da'
+  version '43,38963'
+  sha256 'f4fdffeed4491c77eb8192502e902e55129f6431b7e03ad441d3b1e697a47b75'
 
   # hockeyapp.net/api/2/apps/0172d48cceec171249a8d850fb16276b was verified as official when first introduced to the cask
   url "https://rink.hockeyapp.net/api/2/apps/0172d48cceec171249a8d850fb16276b/app_versions/#{version.after_comma}?format=zip"
   appcast 'https://rink.hockeyapp.net/api/2/apps/0172d48cceec171249a8d850fb16276b',
-          checkpoint: '3084bc784d632deb4d7ec9e6a020ffebf4b53ee69265f7d94377771e213a999a'
+          checkpoint: '98236c4d5e142e4ee0e8713d951db1b069745f7e9d9294e4ea8d4f71e0f4cb6a'
   name 'Sketch'
   homepage 'https://www.sketchapp.com/beta/'