fix: bump scala version

Author: plaflamme

modules/openapi-generator/src/main/resources/scala-sttp4/build.sbt.mustache

@@ -2,7 +2,7 @@ version := "{{artifactVersion}}"
 name := "{{artifactId}}"
 organization := "{{groupId}}"
 
-scalaVersion := "2.13.16"
+scalaVersion := "2.13.18"
 crossScalaVersions := Seq(scalaVersion.value, "2.12.20")
 
 libraryDependencies ++= Seq(

samples/client/petstore/scala-sttp4-circe/build.sbt

@@ -2,7 +2,7 @@ version := "1.0.0"
 name := "openapi-client"
 organization := "org.openapitools"
 
-scalaVersion := "2.13.16"
+scalaVersion := "2.13.18"
 crossScalaVersions := Seq(scalaVersion.value, "2.12.20")
 
 libraryDependencies ++= Seq(

samples/client/petstore/scala-sttp4/build.sbt

@@ -2,7 +2,7 @@ version := "1.0.0"
 name := "openapi-client"
 organization := "org.openapitools"
 
-scalaVersion := "2.13.16"
+scalaVersion := "2.13.18"
 crossScalaVersions := Seq(scalaVersion.value, "2.12.20")
 
 libraryDependencies ++= Seq(