Update versions of gradle, http4k etc

Author: daviddenton

frameworks/Kotlin/http4k/core-pgclient/build.gradle.kts

@@ -1,4 +1,4 @@
 dependencies {
     api(project(":core"))
-    api("io.vertx:vertx-pg-client:4.4.4")
+    api("io.vertx:vertx-pg-client:4.5.7")
 }