circle ci: use silex -ci images instead of -dev

*-dev images have been removed

Silex/docker-emacs@0ed9037

Author: ikappaki

.circleci/config.yml

@@ -56,31 +56,31 @@ commands:
 jobs:
   test-ubuntu-emacs-26:
     docker:
-      - image: silex/emacs:26-dev
+      - image: silex/emacs:26-ci
         entrypoint: bash
     steps:
       - setup
       - test
 
   test-ubuntu-emacs-27:
     docker:
-      - image: silex/emacs:27-dev
+      - image: silex/emacs:27-ci
         entrypoint: bash
     steps:
       - setup
       - test
 
   test-ubuntu-emacs-28:
     docker:
-      - image: silex/emacs:28-dev
+      - image: silex/emacs:28-ci
         entrypoint: bash
     steps:
       - setup
       - test
 
   test-ubuntu-emacs-master:
     docker:
-      - image: silex/emacs:master-dev
+      - image: silex/emacs:master-ci
         entrypoint: bash
     steps:
       - setup
@@ -105,7 +105,7 @@ jobs:
 
   test-lint:
     docker:
-      - image: silex/emacs:28-dev
+      - image: silex/emacs:28-ci
     steps:
       - setup
       - lint