Update scala-library, scala-reflect to 2.13.8

Author: scala-steward

.github/workflows/test.yml

@@ -9,7 +9,7 @@ jobs:
   build:
     strategy:
       matrix:
-        scalaVersion: ["2.12.15", "2.13.7"]
+        scalaVersion: ["2.12.15", "2.13.8"]
     runs-on: ubuntu-20.04
 
     steps:

build.sbt

@@ -3,7 +3,7 @@ import sbtcrossproject.CrossPlugin.autoImport.{ crossProject, CrossType }
 
 val monocleVersion = "2.0.4"
 val acyclicVersion = "0.2.0"
-val crossScalaVersionList = Seq("2.12.15", "2.13.7")
+val crossScalaVersionList = Seq("2.12.15", "2.13.8")
 
 val sharedSettings = Seq(
   crossScalaVersions := crossScalaVersionList,