Update 3.4.0 ReleaseNote to add list of gems that promoted from default gems to bundled gems.

[hshimoyama]

Ruby 3.4.0 ReleaseNote announced that several default gems would be promoted to bundled gems in a future version.
https://www.ruby-lang.org/en/news/2023/12/25/ruby-3-3-0-released/

And this change was actually implemented in Ruby 3.4.0, but it was not mentioned in the release notes.

When I upgraded to Ruby 3.4, I encountered an error with require 'nkf'. At that time, I Couldn't find official documentation to confirm that nkf had become a bundled gem. So I thought it would be helpful to have this information in the Ruby 3.4.0 release notes, so I've gone ahead and added it.

I made these changes by referencing a similar section in the Ruby 3.3.0 release notes.

www.ruby-lang.org/en/news/_posts/2023-12-25-ruby-3-3-0-released.md

Lines 253 to 255 in 3b8ae04

	The following bundled gem is promoted from default gems.
	* racc 1.7.3

As a native Japanese speaker, I am confident in the accuracy of the Japanese (ja) description. For the other languages, it seemed appropriate to copy the same wording, so I have applied the same update.

The one exception is Portuguese (pt), which I have excluded from this change because a corresponding release note for Ruby 3.3.0 did not exist to use as a reference.

I confirmed the target file by running the following command:

$ find . -name 2024-12-25-ruby-3-4-0-released.md
./ja/news/_posts/2024-12-25-ruby-3-4-0-released.md
./zh_tw/news/_posts/2024-12-25-ruby-3-4-0-released.md
./zh_cn/news/_posts/2024-12-25-ruby-3-4-0-released.md
./pt/news/_posts/2024-12-25-ruby-3-4-0-released.md
./de/news/_posts/2024-12-25-ruby-3-4-0-released.md
./ko/news/_posts/2024-12-25-ruby-3-4-0-released.md
./es/news/_posts/2024-12-25-ruby-3-4-0-released.md
./en/news/_posts/2024-12-25-ruby-3-4-0-released.md

And I confirmed the list of gems promoted to bundled gems, and their corresponding versions, by reviewing the diff of the following files.

• https://github.com/ruby/ruby/blob/v3_3_0/gems/bundled_gems
• https://github.com/ruby/ruby/blob/v3_4_0/gems/bundled_gems

[hshimoyama]

www.ruby-lang.org/de/news/_posts/2023-12-25-ruby-3-3-0-released.md

Lines 248 to 250 in 3b8ae04

	Das folgende mitinstallierten Gem wird von Standard-Gems gefördert.
	- racc 1.7.3

[hshimoyama]

www.ruby-lang.org/en/news/_posts/2023-12-25-ruby-3-3-0-released.md

Lines 253 to 255 in 3b8ae04

	The following bundled gem is promoted from default gems.
	* racc 1.7.3

[hshimoyama]

www.ruby-lang.org/es/news/_posts/2023-12-25-ruby-3-3-0-released.md

Lines 338 to 340 in 3b8ae04

	La siguiente gema incluida ha sido promovida a gema predeterminada.
	* racc 1.7.3

[hshimoyama]

www.ruby-lang.org/ja/news/_posts/2023-12-25-ruby-3-3-0-released.md

Lines 223 to 225 in 3b8ae04

	新たに以下の gem が default gems から bundled gems に変更されました。
	* racc 1.7.3

[hshimoyama]

www.ruby-lang.org/ko/news/_posts/2023-12-25-ruby-3-3-0-released.md

Lines 251 to 253 in 3b8ae04

	다음 기본 gem이 내장됩니다.
	* racc 1.7.3

[hshimoyama]

www.ruby-lang.org/zh_cn/news/_posts/2023-12-25-ruby-3-3-0-released.md

Lines 234 to 236 in 3b8ae04

	以下默认 gem 成为绑定 gem
	* racc 1.7.3

[hshimoyama]

www.ruby-lang.org/zh_tw/news/_posts/2023-12-25-ruby-3-3-0-released.md

Lines 231 to 233 in 3b8ae04

	下列的預設 gem 現在是 bundled gems。
	* racc 1.7.3

[hshimoyama]

Thank you for your correction. It made me realize that my copy-paste approach is grammatically incorrect due to the singular vs. plural mismatch between the 3.3.0 and 3.4.0.

This likely affects the de, ko, zh_cn, and zh_tw files as well. Since I'm not a native speaker of these languages, it would be a great help if native speakers could provide the correct phrasing.

If no one is available to help after a little while, I plan to revert the changes for those languages and limit the scope of this PR to just ja, en, and es.