Bump io.github.problem4j:problem4j-core from 1.4.1 to 1.4.2 (#37)

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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 = "1.4.1"
+problem4j-core = "1.4.2"
 spotless = "8.2.1"
 
 [plugins]