Fixup circleci Go image.

Signed-off-by: SuperQ <superq@gmail.com>

Author: SuperQ

.circleci/config.yml

@@ -8,7 +8,7 @@ executors:
   # This must match .promu.yml.
   golang:
     docker:
-      - image: circleci/golang:1.18
+      - image: cimg/go:1.18
 
 jobs:
   test: