Drop java 8, support java 20

.github/workflows/ci.yml

@@ -22,23 +22,15 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        scala: [2.12.18]
-        java: [temurin@8, temurin@11, temurin@17]
+        scala: [2.13.10]
+        java: [temurin@11, temurin@17, temurin@20]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout current branch (full)
         uses: actions/checkout@v3
         with:
           fetch-depth: 0
 
-      - name: Setup Java (temurin@8)
-        if: matrix.java == 'temurin@8'
-        uses: actions/setup-java@v3
-        with:
-          distribution: temurin
-          java-version: 8
-          cache: sbt
-
       - name: Setup Java (temurin@11)
         if: matrix.java == 'temurin@11'
         uses: actions/setup-java@v3
@@ -55,6 +47,14 @@ jobs:
           java-version: 17
           cache: sbt
 
+      - name: Setup Java (temurin@20)
+        if: matrix.java == 'temurin@20'
+        uses: actions/setup-java@v3
+        with:
+          distribution: temurin
+          java-version: 20
+          cache: sbt
+
       - name: Check that workflows are up to date
         run: sbt '++ ${{ matrix.scala }}' githubWorkflowCheck
 

build.sbt

@@ -147,11 +147,11 @@ def scalacTargets(scalaVersion: String): Seq[String] = {
 }
 
 // Config for sbt-github-actions plugin
-ThisBuild / crossScalaVersions := Seq("2.12.18")
+ThisBuild / crossScalaVersions := Seq("2.13.10")
 ThisBuild / githubWorkflowPublishTargetBranches := Seq()
 ThisBuild / githubWorkflowJavaVersions := Seq(
-  JavaSpec.temurin("8"),
   JavaSpec.temurin("11"),
-  JavaSpec.temurin("17")
+  JavaSpec.temurin("17"),
+  JavaSpec.temurin("20")
 )