Switch to using --debug

--debug was fixed in https://github.com/jupyterlab/jupyterlab/pull/9715
(commit: 6a0626f2dfee3ec34e5bd36b4f8e94c77b2c40bf)

scripts/ci_script.ps1

@@ -7,7 +7,7 @@ python -c "from jupyterlab.commands import build_check; build_check()"
 if ($LASTEXITCODE -ne 0) { throw "Command failed. See above errors for details" }
 
 if ($Env:GROUP -eq "python") {
-    jupyter lab build --log-level=DEBUG
+    jupyter lab build --debug
     if ($LASTEXITCODE -ne 0) { throw "Command failed. See above errors for details" }
 
     # Run the python tests

scripts/ci_script.sh

@@ -12,7 +12,7 @@ fi
 
 
 if [[ $GROUP == python ]]; then
-    jupyter lab build --log-level=DEBUG
+    jupyter lab build --debug
     # Run the python tests
     py.test
 fi