clnvm: Update check task

CI was complaining about the usage of `--extra`, switch to `--dev`
instead to include the `dev` dependency-group.

Signed-off-by: Peter Neuroth <pet.v.ne@gmail.com>

libs/cln-version-manager/.tasks.yml

@@ -3,8 +3,8 @@ version: '3'
 tasks:
   check:
     cmds:
-      - uv run --extra dev mypy clnvm
-      - uv run --extra dev pytest tests -vvv -s
+      - uv run --dev mypy clnvm
+      - uv run --dev pytest tests -vvv -s
 
   build:
     cmds: