Update Scala versions for CI builds

Author: ikhoon

.github/workflows/test.yml

@@ -26,10 +26,10 @@ jobs:
           java-version: 15
       - name: "2.13 Test"
         if: ${{ github.base_ref == 'main' }}
-        run: sbt "++ 2.13.5 test"
+        run: sbt "++ 2.13.6 test"
       - name: "2.12 Test"
         if: ${{ github.base_ref == 'main' }}
-        run: sbt "++ 2.12.13 test"
+        run: sbt "++ 2.12.14 test"
       - name: "2.11 Test"
         if: ${{ github.base_ref == '0.1.x' }}
         run: sbt "++ 2.11.12 test"