Bump problem4j-core to 1.4.3

Author: damianmalczewski

gradle/libs.versions.toml

@@ -7,7 +7,7 @@ jspecify = "1.0.0"
 junit = "6.0.3"
 nmcp = "1.4.4"
 nullaway = "0.13.1"
-problem4j-core = "1.4.2"
+problem4j-core = "1.4.3"
 spotless = "8.3.0"
 
 [plugins]