Stay on cinc 18.4.12 for testing for now

Author: taylorific

.github/workflows/ci.yml

@@ -55,7 +55,7 @@ jobs:
         kitchen test ${{ matrix.os }}
       env:
         CHEF_LICENSE: accept-no-persist
-        CHEF_VERSION: 18.6.14
+        CHEF_VERSION: 18.4.12
   shellcheck:
     runs-on: ubuntu-latest
     steps: