Skip two Bundler plugins known to be outdated

I ran the Rake task locally, and got the data/ file updated like that.

Fixes #1231

data/known_plugins.yml

@@ -28,12 +28,6 @@
 - :name: bundler-ecology
   :summary: Bundler plugin to avoid installing unwanted gems
   :uri: https://github.com/eco-rb/bundler-ecology
-- :name: bundler-explain
-  :summary: Explains bundle update conflicts
-  :uri: https://github.com/jhawthorn/bundler-explain
-- :name: bundler-fast_git
-  :summary: Make bundler git source faster
-  :uri: https://github.com/mtsmfm/bundler-fast_git
 - :name: bundler-graph
   :summary: Generates a visual dependency graph for your Gemfile
   :uri: https://github.com/rubygems/bundler-graph

lib/tasks/regenerate_known_plugins_yml.rake

@@ -13,6 +13,8 @@ task :regenerate_known_plugins_yml do
     bundler-interactive source-does-not-exist yanked-all-but-last
     bundler-next
     bundler-security
+    bundler-explain
+    bundler-fast_git
   ]
 
   rubygems = Gem::Source.new("https://rubygems.org")