изменил сборку с 20 на 21 jdk

Author: theshadowco

.github/workflows/check.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        java_version: ['17', '20']
+        java_version: ['17', '21']
         os: [ubuntu-latest, windows-latest, macOS-latest]
         include:
           - os: windows-latest