Remove unused vendor Gemfiles

Ruby core does not invoke the RubyGems vendoring workflow.

tool/bundler/vendor_gems.rb

@@ -1,17 +0,0 @@
-# frozen_string_literal: true
-
-source "https://rubygems.org"
-
-gem "fileutils", "1.8.0"
-gem "molinillo", github: "cocoapods/molinillo", ref: "1d62d7d5f448e79418716dc779a4909509ccda2a"
-gem "net-http", "0.7.0" # net-http-0.8.0 is broken with JRuby
-gem "net-http-persistent", "4.0.6"
-gem "net-protocol", "0.2.2"
-gem "optparse", "0.8.0"
-gem "pub_grub", github: "jhawthorn/pub_grub", ref: "df6add45d1b4d122daff2f959c9bd1ca93d14261"
-gem "resolv", "0.6.2"
-gem "securerandom", "0.4.1"
-gem "timeout", "0.4.4"
-gem "thor", "1.4.0"
-gem "tsort", "0.2.0"
-gem "uri", "1.1.1"

tool/bundler/vendor_gems.rb.lock

@@ -1,75 +0,0 @@
-GIT
-  remote: https://github.com/cocoapods/molinillo.git
-  revision: 1d62d7d5f448e79418716dc779a4909509ccda2a
-  ref: 1d62d7d5f448e79418716dc779a4909509ccda2a
-  specs:
-    molinillo (0.8.0)
-
-GIT
-  remote: https://github.com/jhawthorn/pub_grub.git
-  revision: df6add45d1b4d122daff2f959c9bd1ca93d14261
-  ref: df6add45d1b4d122daff2f959c9bd1ca93d14261
-  specs:
-    pub_grub (0.5.0)
-
-GEM
-  remote: https://rubygems.org/
-  specs:
-    connection_pool (2.5.4)
-    fileutils (1.8.0)
-    net-http (0.7.0)
-      uri
-    net-http-persistent (4.0.6)
-      connection_pool (~> 2.2, >= 2.2.4)
-    net-protocol (0.2.2)
-      timeout
-    optparse (0.8.0)
-    resolv (0.6.2)
-    securerandom (0.4.1)
-    thor (1.4.0)
-    timeout (0.4.4)
-    tsort (0.2.0)
-    uri (1.1.1)
-
-PLATFORMS
-  java
-  ruby
-  universal-java
-  x64-mingw-ucrt
-  x64-mswin64-140
-  x86_64-darwin
-  x86_64-linux
-
-DEPENDENCIES
-  fileutils (= 1.8.0)
-  molinillo!
-  net-http (= 0.7.0)
-  net-http-persistent (= 4.0.6)
-  net-protocol (= 0.2.2)
-  optparse (= 0.8.0)
-  pub_grub!
-  resolv (= 0.6.2)
-  securerandom (= 0.4.1)
-  thor (= 1.4.0)
-  timeout (= 0.4.4)
-  tsort (= 0.2.0)
-  uri (= 1.1.1)
-
-CHECKSUMS
-  connection_pool (2.5.4) sha256=e9e1922327416091f3f6542f5f4446c2a20745276b9aa796dd0bb2fd0ea1e70a
-  fileutils (1.8.0) sha256=8c6b1df54e2540bdb2f39258f08af78853aa70bad52b4d394bbc6424593c6e02
-  molinillo (0.8.0)
-  net-http (0.7.0) sha256=4db7d9f558f8ffd4dcf832d0aefd02320c569c7d4f857def49e585069673a425
-  net-http-persistent (4.0.6) sha256=2abb3a04438edf6cb9e0e7e505969605f709eda3e3c5211beadd621a2c84dd5d
-  net-protocol (0.2.2) sha256=aa73e0cba6a125369de9837b8d8ef82a61849360eba0521900e2c3713aa162a8
-  optparse (0.8.0) sha256=ef6b7fbaf7ec331474f325bc08dd5622e6e1e651007a5341330ee4b08ce734f0
-  pub_grub (0.5.0)
-  resolv (0.6.2) sha256=61efe545cedddeb1b14f77e51f85c85ca66af5098fdbf567fadf32c34590fb14
-  securerandom (0.4.1) sha256=cc5193d414a4341b6e225f0cb4446aceca8e50d5e1888743fac16987638ea0b1
-  thor (1.4.0) sha256=8763e822ccb0f1d7bee88cde131b19a65606657b847cc7b7b4b82e772bcd8a3d
-  timeout (0.4.4) sha256=f0f6f970104b82427cd990680f539b6bbb8b1e55efa913a55c6492935e4e0edb
-  tsort (0.2.0) sha256=9650a793f6859a43b6641671278f79cfead60ac714148aabe4e3f0060480089f
-  uri (1.1.1) sha256=379fa58d27ffb1387eaada68c749d1426738bd0f654d812fcc07e7568f5c57c6
-
-BUNDLED WITH
-  4.0.0.dev