Uninstall dependabot gem

Author: soutaro

.github/workflows/windows.yml

@@ -31,6 +31,8 @@ jobs:
             require "open-uri"
             require "json"
 
+            system "gem uninstall --force dependabot", exception: true
+
             res = URI.parse("https://stdgems.org/bundled_gems.json").read
             bundled_gems = JSON.parse(res)["gems"].map{_1["gem"]}
             system "gem uninstall #{bundled_gems.join(" ")}", exception: true