Update model:core to 1.7.12

Author: scala-steward

build.sbt

@@ -10,7 +10,7 @@ val scala2alive = List(scala2_12, scala2_13)
 val scala3 = List("3.3.5")
 val akkaVersion = "2.6.20"
 val pekkoVersion = "1.1.3"
-val sttpModelVersion = "1.7.11"
+val sttpModelVersion = "1.7.12"
 
 val scalaTestVersion = "3.2.19"
 val zio1Version = "1.0.18"