Small fixes to GitHub Actions job matrix

Author: ashawley

.github/workflows/scala.yml

@@ -36,13 +36,14 @@ jobs:
         deploy: [false]
         exclude:
         - platform: jvm
-          scalajs_version: 1.3.0
+          scalajs_version: 0.6.33
         - platform: js
           jdk: 11
         - platform: js
           scala: 0.27.0-RC1
         - platform: js
           scala: 2.11.12
+          scalajs_version: 0.6.33
         - jdk: 11
           scala: 2.11.12
         - jdk: 11