Update scala-library to 2.12.18 (ReactiveMongo#1224)

* Update scala-library to 2.12.18

* Update config.yml

---------

Co-authored-by: Cédric Chantepie <[email protected]>

Author: scala-steward

.circleci/config.yml

@@ -292,7 +292,7 @@ jobs:
         default: 10
       scala_version:
         type: string
-        default: "2.12.17"
+        default: "2.12.18"
       akka_version:
         type: string
         default: "2.5.23"
@@ -403,7 +403,7 @@ workflows:
           os: osx
           e: osx
           jdk_version: jdk8
-          scala_version: 2.12.17
+          scala_version: 2.12.18
           shaded: false
 
       - unit_test_suite:
@@ -412,7 +412,7 @@ workflows:
             name: openjdk
             version: 10
           jdk_version: openjdk10
-          scala_version: 2.12.17
+          scala_version: 2.12.18
 
       - integration_test_suite:
           name: mongo3_openjdk8_scala211_akka23

project/Common.scala

@@ -53,7 +53,7 @@ object Common extends AutoPlugin {
 
   override def projectSettings =
     Defaults.coreDefaultSettings ++ baseSettings ++ Compiler.settings ++ Seq(
-      scalaVersion := "2.12.17",
+      scalaVersion := "2.12.18",
       crossScalaVersions := Seq(
         scala211,
         scalaVersion.value,