CI: Move to new circle machine tags

Author: mgxd

.circleci/config.yml

@@ -4,7 +4,7 @@ _machine_defaults: &machine_defaults
     TZ: "/usr/share/zoneinfo/America/Los_Angeles"
     SCRATCH: "/scratch"
   machine:
-    image: ubuntu-2204:2023.04.2
+    image: default
     docker_layer_caching: true
   working_directory: /tmp/src/fmriprep
   resource_class: large