Go back to JUnit 5.12.1 to avoid version conflicts

Author: purejava

gradle/libs.versions.toml

@@ -4,9 +4,9 @@
 [versions]
 org-apache-commons-commons-lang3 = "3.17.0"
 org-json-json = "20250107"
-org-junit-jupiter-junit-jupiter = "5.12.2"
-org-junit-jupiter-junit-jupiter-api = "5.12.2"
-org-junit-jupiter-junit-jupiter-engine = "5.12.2"
+org-junit-jupiter-junit-jupiter = "5.12.1"
+org-junit-jupiter-junit-jupiter-api = "5.12.1"
+org-junit-jupiter-junit-jupiter-engine = "5.12.1"
 org-purejava-tweetnacl-java = "1.1.2"
 org-slf4j-slf4j-api = "2.0.17"
 org-slf4j-slf4j-simple = "2.0.17"