Create release for 3.4.8 (#3691)

* Create release for 3.4.8

* Update _data for Ruby 3.4.8

* Write up Ruby 3.4.8 Released

---------

Co-authored-by: GitHub Actions Bot <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Takashi Kokubun <takashikkbn@gmail.com>

Author: 3 people

_data/downloads.yml

@@ -9,7 +9,7 @@ preview:
 
 stable:
 
-  - 3.4.7
+  - 3.4.8
   - 3.3.10
   - 3.2.9
 

_data/releases.yml

@@ -83,6 +83,30 @@
 
 # 3.4 series
 
+- version: 3.4.8
+  date: 2025-12-17
+  post: /en/news/2025/12/17/ruby-3-4-8-released/
+  url:
+    gz:  https://cache.ruby-lang.org/pub/ruby/3.4/ruby-3.4.8.tar.gz
+    zip: https://cache.ruby-lang.org/pub/ruby/3.4/ruby-3.4.8.zip
+    xz:  https://cache.ruby-lang.org/pub/ruby/3.4/ruby-3.4.8.tar.xz
+  size:
+    gz:  23288284
+    zip: 28478666
+    xz:  17320860
+  sha1:
+    gz:  4474a53941ca3c8bb38a3e5cf458305660037a70
+    zip: f18dc16d5b0dc8b46462bfe144ab60100d25e232
+    xz:  4e373f5741550d4ef68c2e5e8efc2ce5b0199179
+  sha256:
+    gz:  53c4ddad41fbb6189f1f5ee0db57a51d54bd1f87f8755b3d68604156a35b045b
+    zip: 57609d2c40b6595b718d23dae64365d9a822375a6062fe9d5bef2d37679e2f28
+    xz:  53a8ec71111449cbbd42224d8d27c493fa6ded228636731051c48604d4255d68
+  sha512:
+    gz:  ccacb88fd1811c7b9d8012c4ef24b3c3c43a7ec6c37ebfdb0ec4ace68db8b094fac3f001deac7b18d39edd8006822a4713bcf14cfcfc229be188c477e6175692
+    zip: ef0140054858ff227e550b68034e505f11712d2878f1d2d8415839a00026427dfeac03893fb5272403ce9576bc80ec067093de0a003d9977f9eec23e3cc5169d
+    xz:  b6289654685c2d381d15123cf07a131fd088edf13a5336966af5a2e8fad9adda42d14caa7bb0998331831af71e35c546091db55c82089e89b9508603ff5f92d6
+
 - version: 3.4.7
   date: 2025-10-07
   post: /en/news/2025/10/07/ruby-3-4-7-released/

en/news/_posts/2025-12-17-ruby-3-4-8-released.md

@@ -0,0 +1,50 @@
+---
+layout: news_post
+title: "Ruby 3.4.8 Released"
+author: k0kubun
+translator:
+date: 2025-12-17 00:24:30 +0000
+lang: en
+---
+
+Ruby 3.4.8 has been released.
+
+This is a routine update that includes bug fixes.
+Please refer to the [release notes on GitHub](https://github.com/ruby/ruby/releases/tag/v3_4_8) for further details.
+
+## Release Schedule
+
+We intend to release the latest stable Ruby version (currently Ruby 3.4) every two months following the most recent release.
+Ruby 3.4.9 is scheduled for February.
+
+If a change arises that significantly affects users, a release may occur earlier than planned, and the subsequent schedule may shift accordingly.
+
+## Download
+
+{% assign release = site.data.releases | where: "version", "3.4.8" | first %}
+
+* <{{ release.url.gz }}>
+
+      SIZE: {{ release.size.gz }}
+      SHA1: {{ release.sha1.gz }}
+      SHA256: {{ release.sha256.gz }}
+      SHA512: {{ release.sha512.gz }}
+
+* <{{ release.url.xz }}>
+
+      SIZE: {{ release.size.xz }}
+      SHA1: {{ release.sha1.xz }}
+      SHA256: {{ release.sha256.xz }}
+      SHA512: {{ release.sha512.xz }}
+
+* <{{ release.url.zip }}>
+
+      SIZE: {{ release.size.zip }}
+      SHA1: {{ release.sha1.zip }}
+      SHA256: {{ release.sha256.zip }}
+      SHA512: {{ release.sha512.zip }}
+
+## Release Comment
+
+Many committers, developers, and users who provided bug reports helped us make this release.
+Thanks for their contributions.