feat: add support for Scala 2.13.8 (#441)

Addresses #430

Author: ckipp01

Diff for: .github/workflows/ci.yml

@@ -23,9 +23,9 @@ jobs:
             { version: '2.12.15' },
             { version: '2.12.14' },
             { version: '2.12.13' },
+            { version: '2.13.8' },
+            { version: '2.13.7' },
             { version: '2.13.6' },
-            { version: '2.13.5' },
-            { version: '2.13.4' }
           ]
     steps:
       - name: checkout the repo

Diff for: build.sbt

@@ -2,9 +2,9 @@ import sbtcrossproject.CrossProject
 import sbtcrossproject.CrossType
 
 lazy val munitVersion = "0.7.29"
-lazy val scalametaVersion = "4.4.30"
+lazy val scalametaVersion = "4.4.32"
 lazy val defaultScala212 = "2.12.15"
-lazy val defaultScala213 = "2.13.7"
+lazy val defaultScala213 = "2.13.8"
 lazy val defaultScala3 = "3.1.0"
 lazy val bin212 =
   Seq(
@@ -20,6 +20,7 @@ lazy val bin212 =
 lazy val bin213 =
   Seq(
     defaultScala213,
+    "2.13.7",
     "2.13.6",
     "2.13.5",
     "2.13.4",