Update scala-library to 2.12.20 in series/0.x

Author: typelevel-steward[bot]

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        scala: [3.3.4, 2.12.19, 2.13.12]
+        scala: [3.3.4, 2.12.20, 2.13.12]
         java: [temurin@11]
     runs-on: ${{ matrix.os }}
     steps:

build.sbt

@@ -23,7 +23,7 @@ ThisBuild / organization := "com.codecommit"
 ThisBuild / publishGithubUser := "djspiewak"
 ThisBuild / publishFullName := "Daniel Spiewak"
 
-ThisBuild / crossScalaVersions := Seq("3.3.4", "2.12.19", "2.13.12")
+ThisBuild / crossScalaVersions := Seq("3.3.4", "2.12.20", "2.13.12")
 
 ThisBuild / githubWorkflowTargetBranches := Seq("series/0.x")