Bump json-unit-version from 3.5.0 to 4.0.0 (#925)

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -15,7 +15,7 @@ assertj-core-version = "3.26.3"
 assertj-db-version = "2.0.2"
 mockito-version = "5.14.2"
 awaitility-version = "4.2.2"
-json-unit-version = "3.5.0"
+json-unit-version = "4.0.0"
 kitteh-irc-version = "9.0.0"
 hikari-cp-version = "6.2.0"
 mariadb-version = "3.5.0"