Update Gemfile to remove bundler spec (#21541)

Inadvertently committed. Not working with Netlify builds.

Author: mikeCRL

src/current/Gemfile

@@ -13,7 +13,6 @@ gem "redcarpet", "~> 3.6"
 gem "rss"
 gem "webrick"
 gem "jekyll-minifier"
-gem "bundler", "~> 2.4"
 gem "csv"
 gem "logger"
 gem "base64"