Update tapir-core, tapir-json-circe to 1.11.18 (#629)

Author: scala-steward

build.sbt

@@ -9,7 +9,7 @@ val versions = new {
   val outwatch = "1.1.0"
   val colibri  = "0.8.6"
   val funStack = "0.9.23"
-  val tapir    = "1.11.17"
+  val tapir    = "1.11.18"
   val pprint   = "0.9.0"
 }