Bump version to 21.3.1

mezz · mezz · commit 2bebbd7d611b · 2025-06-03T22:49:44.000+09:00
diff --git a/gradle.properties b/gradle.properties
@@ -53,4 +53,4 @@ modrinthId=u6dRKJwZ
 jUnitVersion=5.10.2
 
 # Version
-specificationVersion=21.3.0
+specificationVersion=21.3.1
