Revert "Update scala-library, scala-reflect to 2.12.20 (zio#1157)" (zio#1242)

This reverts commit b7e453b.

Author: plokhotnyuk

.github/workflows/ci.yml

@@ -79,7 +79,7 @@ jobs:
       fail-fast: false
       matrix:
         java: ['17', '21']
-        scala: ['2.12.20', '2.13.15', '3.3.4']
+        scala: ['2.12.19', '2.13.15', '3.3.4']
         platform: ['JVM', 'JS', 'Native']
     steps:
       - name: Checkout current branch