Revert "Ruby 4.0.0 Released (#3748)"

This reverts commit fad25a1.

Author: nurse

_data/branches.yml

@@ -9,8 +9,8 @@
 #   eol_date: date of EOL (YYYY-MM-DD)
 
 - name: 4.0
-  status: normal maintenance
-  date: 2025-12-25
+  status: preview
+  date:
   eol_date:
 
 - name: 3.4

_data/downloads.yml

@@ -4,10 +4,10 @@
 # optional
 preview:
 
+  - 4.0.0-preview3
 
 stable:
 
-  - 4.0.0
   - 3.4.8
   - 3.3.10
   - 3.2.9

_data/releases.yml

@@ -21,35 +21,6 @@
 
 # 4.0 series
 
-- version: 4.0.0
-  date: 2025-12-25
-  post: /en/news/2025/12/25/ruby-4-0-0-released/
-  tag: v4.0.0
-  stats:
-    files_changed: 3889
-    insertions: 230769
-    deletions: 297003
-  url:
-    gz:  https://cache.ruby-lang.org/pub/ruby/4.0/ruby-4.0.0.tar.gz
-    zip: https://cache.ruby-lang.org/pub/ruby/4.0/ruby-4.0.0.zip
-    xz:  https://cache.ruby-lang.org/pub/ruby/4.0/ruby-4.0.0.tar.xz
-  size:
-    gz:  23955109
-    zip: 29253204
-    xz:  18008368
-  sha1:
-    gz:  754e39e9ad122e1b6deaed860350bac133a35ed3
-    zip: 0b69f89d1d140157251c0d3a6032f6c45cdf81e8
-    xz:  05ec670e86f84325c5353ef2f2888e53b6adc602
-  sha256:
-    gz:  2e8389c8c072cb658c93a1372732d9eac84082c88b065750db1e52a5ac630271
-    zip: 70cb1bf89279b86ab9a975d504607c051fc05ee03e311d550a5541b65e373455
-    xz:  a72bacee9de07283ebc19baa4ac243b193129f21aa4e168c7186fb1fe7d07fe1
-  sha512:
-    gz:  688254e939b197d564e896fb951bc1abf07142f489e91c5ed0b11f68f52d6adb6b1f86616fe03f1f0bb434beeef7e75e158b9c616afb39bb34403b0b78d2ee19
-    zip: a72e076ef618c0aeb9d20cf22e6fb12fda36809c0064ef0f98153b95a0bac257ef606342444a38f992c4594bf376a4d264686cf597463aa6f111220798784302
-    xz:  2d5b2e566eaf70a5f3ea6ce6afc0611c0415de58a41336ef7a0b855c9a91eda9aa790a5f8b48e40a1eb9d50f8ea0f687216e617f16c8d040a08474f3116518a4
-
 - version: 4.0.0-preview3
   date: 2025-12-18
   post: /en/news/2025/12/18/ruby-4-0-0-preview3-released/