Update OHW Python image and user groups

First update to OceanHackWeek's Python image for 2024 (we're trying pixi!). Additionally updating our user groups and adding Christian as an admin.

xref 2i2c-org#4469

config/clusters/2i2c/ohw.values.yaml

@@ -26,7 +26,7 @@ basehub:
           description: "~2 CPU, ~8G RAM"
           default: true
           kubespawner_override:
-            image: "ghcr.io/oceanhackweek/python:c3d1f4b"
+            image: "ghcr.io/oceanhackweek/python:341190e"
             default_url: "/lab"
             mem_limit: 8G
             mem_guarantee: 4G
@@ -75,15 +75,15 @@ basehub:
         GitHubOAuthenticator:
           oauth_callback_url: https://oceanhackweek.2i2c.cloud/hub/oauth_callback
           allowed_organizations:
-            - oceanhackweek:ohw23-organizers
-            - oceanhackweek:ohw23-participants-australia
-            - oceanhackweek:ohw23-participants-seattle
-            - oceanhackweek:ohw23-participants-virtual
-            - oceanhackweek:ohw23-project-mentors
-            - oceanhackweek:ohw23-tutorial-presenters
+            - oceanhackweek:ohw24-organizers
+            - oceanhackweek:ohw24-participants-australia
+            - oceanhackweek:ohw24-participants-bigelow
+            - oceanhackweek:ohw24-project-mentors
+            - oceanhackweek:ohw24-tutorial-presenters
           scope:
             - read:org
         Authenticator:
           admin_users:
             - ocefpaf
             - abkfenris
+            - cpsarason