CI - clear cache after mass update.

[cache clear]

rakefile

@@ -178,7 +178,7 @@ task :check_license do
       git config user.name #{ENV['PUBLISHER_NAME']} && \\
       git config user.email #{ENV['PUBLISHER_EMAIL']} && \\
       git add #{bump_copyright_year.join ' '} && \\
-      if git commit -qm 'GH Actions: Bump copyright to #{Time.now.year}.'; then git push; fi
+      if git commit -qm 'GH Actions: Bump copyright to #{Time.now.year}.\n[cache clear]'; then git push; fi
     } or abort "Failed to push copyright update"
     dispatch = 0
   else