Update scala-compiler to 2.12.18

Author: scala-steward

.github/workflows/ci.yml

@@ -23,7 +23,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        scala: [2.11.12, 2.12.8, 2.13.1]
+        scala: [2.11.12, 2.12.18, 2.13.1]
         java: [temurin@8]
     runs-on: ${{ matrix.os }}
     steps:

build.sbt

@@ -14,7 +14,7 @@ val shapelessVersion = "2.3.7"
 val scalaCheckVersion = "1.15.2"
 
 val Scala_2_11 = "2.11.12"
-val Scala_2_12 = "2.12.8"
+val Scala_2_12 = "2.12.18"
 val Scala_2_13 = "2.13.1"
 
 /// sbt-github-actions configuration