Fix installing the releaser in the check release workflow

Author: jtpio

.github/actions/check-release/action.yml

@@ -35,8 +35,7 @@ runs:
         # Install Jupyter Releaser from git unless we are testing Releaser itself
         if ! command -v jupyter-releaser &> /dev/null
         then
-            echo "COMMAND could not be found"
-            exit
+            pip install git+https://github.com/jupyter-server/jupyter_releaser.git
         fi
 
         export RH_IS_CHECK_RELEASE=true