using scala 3 features, it's scala 3 only time

.github/workflows/ci.yml

@@ -28,7 +28,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        scala: [2.13, 3]
+        scala: [3]
         java: [temurin@8]
     runs-on: ${{ matrix.os }}
     timeout-minutes: 60
@@ -112,16 +112,6 @@ jobs:
         if: matrix.java == 'temurin@8' && steps.setup-java-temurin-8.outputs.cache-hit == 'false'
         run: sbt reload +update
 
-      - name: Download target directories (2.13)
-        uses: actions/download-artifact@v3
-        with:
-          name: target-${{ matrix.os }}-${{ matrix.java }}-2.13
-
-      - name: Inflate target directories (2.13)
-        run: |
-          tar xf targets.tar
-          rm targets.tar
-
       - name: Download target directories (3)
         uses: actions/download-artifact@v3
         with:

build.sbt

@@ -8,7 +8,6 @@ ThisBuild / developers ++= List(
 )
 
 val Scala3 = "3.3.0"
-ThisBuild / crossScalaVersions := Seq("2.13.11", Scala3)
 ThisBuild / scalaVersion       := Scala3
 
 val Http4sVersion = "1.0.0-M40"