Try to fix other failures of writing XDG_CONFIG_HOME

https://github.com/ruby/actions/actions/runs/756591173
https://github.com/ruby/actions/actions/runs/759073690
https://github.com/ruby/actions/actions/runs/761341026
```
Errno::EACCES: Permission denied @ dir_s_mkdir - /home/runner/.config/irb
```

spec/bundler/commands/console_spec.rb

@@ -45,17 +45,6 @@ RSpec.describe "bundle console", :bundler => "< 3", :readline => true do
     G
   end
 
-  around :each do |example|
-    require 'tmpdir'
-    Dir.mktmpdir("bundler_commands_console") do |dir|
-      xdg_config_home_backup = ENV.delete("XDG_CONFIG_HOME")
-      ENV["XDG_CONFIG_HOME"] = dir
-      example.run
-    ensure
-      ENV["XDG_CONFIG_HOME"] = xdg_config_home_backup
-    end
-  end
-
   it "starts IRB with the default group loaded" do
     bundle "console" do |input, _, _|
       input.puts("puts RACK")

spec/bundler/spec_helper.rb

@@ -4,6 +4,7 @@ require "bundler/psyched_yaml"
 require "bundler/vendored_fileutils"
 require "bundler/vendored_uri"
 require "digest"
+require "tmpdir"
 
 if File.expand_path(__FILE__) =~ %r{([^\w/\.:\-])}
   abort "The bundler specs cannot be run from a path that contains special characters (particularly #{$1.inspect})"
@@ -110,6 +111,16 @@ RSpec.configure do |config|
     end
   end
 
+  config.around :each do |example|
+    Dir.mktmpdir("bundler_commands_console") do |dir|
+      xdg_config_home_backup = ENV.delete("XDG_CONFIG_HOME")
+      ENV["XDG_CONFIG_HOME"] = dir
+      example.run
+    ensure
+      ENV["XDG_CONFIG_HOME"] = xdg_config_home_backup
+    end
+  end
+
   config.after :suite do
     FileUtils.rm_r Spec::Path.pristine_system_gem_path
   end