CircleCI testing

Try a later Ubuntu image to see if we can get bash 5.2 on it

Author: rocky

.circleci/config.yml

@@ -8,7 +8,7 @@ jobs:
       CIRCLE_ARTIFACTS: /tmp/circleci-artifacts
       CIRCLE_TEST_REPORTS: /tmp/circleci-test-results
     docker:
-    - image: cimg/base:2024.01
+    - image: cimg/base:2025.09
     steps:
     # Machine Setup
     #   If you break your build into multiple jobs with workflows, you will probably want to do the parts of this that are relevant in each