Fix copy+paste errors

*Actually* test with Go 1.19 and Go 1.20

Author: jhump

.circleci/config.yml

@@ -32,13 +32,13 @@ jobs:
   build-1-19:
     working_directory: ~/repo
     docker:
-      - image: cimg/go:1.18
+      - image: cimg/go:1.19
     steps: *simple_job_steps
 
   build-1-20:
     working_directory: ~/repo
     docker:
-      - image: cimg/go:1.18
+      - image: cimg/go:1.20
     steps: *simple_job_steps
 
   build-1-21: