can't run on Nim 1.6 due to the chronicles dependency

Author: narimiran

.github/workflows/ci.yml

@@ -10,6 +10,7 @@ jobs:
   build:
     uses: status-im/nimbus-common-workflow/.github/workflows/common.yml@main
     with:
+      nim-versions: '["version-2-0", "version-2-2", "devel"]'
       test-command: |
         nimble install -y chronicles@#head
         nimble install -y unittest2