Update devcontainer.json

change cogent3:cogent3-workshop to cogent3:workshop

Author: khiron

.devcontainer/devcontainer.json

@@ -1,6 +1,6 @@
 {
   "name": "Cogent3 Workshop",
-  "image": "ghcr.io/cogent3/cogent3-workshop:latest",
+  "image": "ghcr.io/cogent3/workshop:latest",
   "runArgs": ["--cpus", "2", "-m", "4g"],
   "customizations": {
     "vscode": {
@@ -26,5 +26,5 @@
     "source=${localEnv:HOME}${localEnv:USERPROFILE}/.ssh,target=/home/user/.ssh,type=bind,consistency=cached",
     "source=${localWorkspaceFolder},target=/home/user/workshop,type=bind,consistency=cached"
   ],
-  "updateContentCommand": "docker pull ghcr.io/cogent3/cogent3-workshop:latest"
+  "updateContentCommand": "docker pull ghcr.io/cogent3/workshop:latest"
 }