2022: Forgot readme

jp7677 · jp7677 · commit 95292d99ae8a · 2025-11-28T15:50:54.000+01:00
diff --git a/2022/README.md b/2022/README.md
@@ -4,7 +4,7 @@ From <https://adventofcode.com/2022>.
 
 ## System requirements
 
-- OpenJDK 17
+- OpenJDK 21
 
 Only Linux has been tested. Other platforms might just work though.
 
